Malicious PDF — malware analysis report

Static analysis result for SHA-256 d320812377adecfe…

MALICIOUS

PDF

68.3 KB Created: 2021-09-25 04:25:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: a6dbc1d77d0a50121f5bbaa11708e392 SHA-1: dfbbfb6fe1156fac60246dac609afffe9d4be750 SHA-256: d320812377adecfe5824938f53744710d9b8e41ebab917588e9639288c7d1562
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of threat. It functions as a link farm, with numerous embedded URLs pointing to various websites, some of which appear to be compromised CMS uploads. The primary purpose seems to be directing users to external, potentially malicious content, rather than containing an active exploit within the PDF itself.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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 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.
  • 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 https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135e021cbb1b---32668630713.pdf In PDF document text
    • http://telegid.tv/userfiles/files/34677545797.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/161371cc3e94ba---73805690304.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613cab00cb7ec---xaxosowatojitajalu.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/cb2550f4407defac8e9750b35b3a8803/kiwofukudaxumusa.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/zomaxefi.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/xosekabix.pdfIn PDF document text
    • https://ppntassone.it/dati/upload/file/kujemubisukakivep.pdfIn PDF document text
    • https://gencshoworganizasyon.com/upload/ckfinder/files/18560413781.pdfIn PDF document text
    • https://jss-moms.si/upload/File/kejov.pdfIn PDF document text
    • http://biznesfishki.ru/files/userfiles/files/52134046072.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613523116a318---75159240181.pdfIn PDF document text
    • https://olivier-daulte.com/ckfinder/userfiles/files/buwodosuvijavinixugixod.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/kiduk.pdfIn PDF document text
    • http://bm-shower.com/userfiles/files/76861095655.pdfIn PDF document text
    • http://dylogistics.com/userData/board/file/jutokizurusimozozusebe.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613f13be774b8---musadomedemagiriwuxumoso.pdfIn PDF document text
    • https://inarsindbari.org/uploads/lafifozabidotedexakuninot.pdfIn PDF document text
    • https://strategieb2b.ca/userfiles/file/91076468417.pdfIn PDF document text
    • http://karaokejdi.com/ckfinder/core/connector/php/upload/files/90317266091.pdfIn PDF document text
    • https://heart-calligraphy.com/uploads/files/202109221303503995.pdfIn PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/96862712289.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=boruto+204+full+episodePDF link annotation
    • 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_off0000adb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c5cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5CC 10696 bytes
SHA-256: 8735eedd32aec0aeff789e24ba5de0d5c83d3990f2beff96a62a9fb13a2bdfca
font_02_sfnt_off0000de8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE8E 14344 bytes
SHA-256: 9ac75342e508aa9108665459c7f44598db467aa83213e9ed4a62aa53df70663d