Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b5e276743f3842a…

MALICIOUS

PDF

85.4 KB Created: 2021-09-04 11:52:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e858a90272b1b223bc3fd00177c316d7 SHA-1: f729abceb6486d03b655a6e1028d5a03adeea005 SHA-256: 6b5e276743f3842af957059c0183de6f20e21d54d4aa52a4c36e19fd9af23904
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains embedded JavaScript and numerous links to external URLs, many of which point to compromised WordPress sites or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to download and execute a second-stage payload. The presence of embedded JavaScript (T1059.007) and the nature of the links suggest an attempt to exploit users via social engineering, aligning with Spearphishing Attachment (T1566.001) and Exploitation for Client Execution (T1203).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a78ea508bfa---39488196321.pdf In PDF document text
    • https://tavio.ru/files/file/daguvexesadabasetum.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/vrc10mliqvdtbg4hjc0v2j0mje/56505851069.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/39576555559.pdfIn PDF document text
    • https://clinicamanila.com/ckfinder/userfiles/files/93342688565.pdfIn PDF document text
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b86f07346bf28f88fa33841b910ffbd1/verovudesugezekusob.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/8889006722.pdfIn PDF document text
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/vrvq1k3cipjjmee5trosqp0j21/xawobevajafaxusexere.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16076a8a3a5eb2---fuzexiwotutemorowibux.pdfIn PDF document text
    • https://kiaavcilar.com/upload/ckfinder/files/52110841101.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16125f7d4898a3---65479233000.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081aafbed565---kubodusapize.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/kojadepixixinosob.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/79328521813.pdfIn PDF document text
    • http://dd-eng.com/files/files/30574941034.pdfIn PDF document text
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210621151927.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/lomirew.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607d07b94248b---niwojetokovaderiwadumuna.pdfIn PDF document text
    • https://memorybg.net/app/templates/js/ckfinder/userfiles/files/tolejepapab.pdfIn PDF document text
    • http://lokalizacja-gps.pl/userfiles/file/19363491940.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160f5d27c02556---jajuxeduvovudujod.pdfIn PDF document text
    • http://studiomedicoveterinariobellucci.eu/userfiles/files/72973114765.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160948fab8fa90---95181180147.pdfIn PDF document text
    • http://danguykhoidoanhnghiephp.vn/Upload/files/10833293853.pdfIn PDF document text
    • http://playitdirect.ca/ckfinder/uploadfiles/files/78404419137.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6a83e7e295---saxuj.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/5562ca9f17c39765f19e952aa9ae5ae0/5674455041.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=modificare+pdf+gratis+programmaPDF link annotation
    • http://cluster006.ovh.net/~greeters/be/ckfinder/userfiles/files/47612383940.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e643.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE643 18596 bytes
SHA-256: 1709847b56750dfbf6b6f95976233c0af449b8965cbc36f945578542e661577b
font_01_sfnt_off0001169a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1169A 10808 bytes
SHA-256: 4623a848f48266a49e8b943fa308f2ee7074b7511a1a176b19062526801930d3
font_02_sfnt_off00012f5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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