Malicious PDF — malware analysis report

Static analysis result for SHA-256 488aad803104d43c…

MALICIOUS

PDF

81.6 KB Created: 2021-09-11 02:08:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 197b2dd41c13b574224bf8f0e3823861 SHA-1: f650f6751b712c9f0fca022adeb89424ea8d7763 SHA-256: 488aad803104d43ce8c4c2d1d4125e723926cf45c1c94c32b8b2e0f4a40255e8
204 Risk Score

Malware Insights

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

The sample contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The JavaScript likely redirects the user to a compromised WordPress upload directory, as indicated by the PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristic. This redirection is intended to download and execute a second-stage payload, as suggested by the PDF_RANDOM_URL_LINK heuristic pointing to a suspicious PDF file. The ML classifier and ClamAV detection further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://accessprecision.com/userfiles/file/61724349989.pdf In PDF document text
    • http://valdhans.cz/userfiles/file/50074963546.pdfIn PDF document text
    • http://radtel-sport.pl/userfiles/file/32380210554.pdfIn PDF document text
    • http://chafewyuok.handysociality.com/upload/files/tetew.pdfIn PDF document text
    • http://www.martiusstaden.org.br/js/ckfinder/userfiles/files/40832736411.pdfIn PDF document text
    • https://cdmsig1.com/ckfinder/userfiles/files/futodukogu.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16132331be97bd---kuxutajizejevixiret.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb45220058---pigupixijurano.pdfIn PDF document text
    • http://decom.pro/admin/ckfinder/userfiles/files/19325800207.pdfIn PDF document text
    • https://sintasyapi.com/img/userfiles/file/kojepotomimije.pdfIn PDF document text
    • https://lmbri.com/WYSIWYGImage/file/xotituxarudavidamen.pdfIn PDF document text
    • https://budgetparking.ca/admin/uploads/file/92002656482.pdfIn PDF document text
    • https://jcmimoveis.com/userfiles/file/41398857322.pdfIn PDF document text
    • https://ms02bet.net/contents/files/72944573877.pdfIn PDF document text
    • http://hotelbellevuepalermo.com/userfiles/files/11946894386.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/dhrgfmu0e3q414iovv9lian3i7/48433015732.pdfIn PDF document text
    • http://tuanayapim.com/rsm/files/89257094658.pdfIn PDF document text
    • https://resonanceacteurs.nl/userfiles/file/4505949164.pdfIn PDF document text
    • http://majorpropertygroup.com/userfiles/files/77359454893.pdfIn PDF document text
    • https://ijieet.org/ckfinder/userfiles/files/95579926831.pdfIn PDF document text
    • http://b40555.handyfriendship.com/upload/files/gikanijinojaw.pdfIn PDF document text
    • http://sh-ruiyangcpa.com/userfiles/file/2021-9///202199612374833.pdfIn PDF document text
    • http://85560891.com/upfolder/e/files/20210909010442.pdfIn PDF document text
    • https://pisangmanis.com/contents/files/katixowojax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=where+can+you+watch+promising+young+woman+onlinePDF 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_off0000d7a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A6 18236 bytes
SHA-256: 2ea318999bcddd50876bdc870f65b77180db21dddb37de5dbae84aa7c58a9f5d
font_01_sfnt_off000106df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106DF 11116 bytes
SHA-256: 7a4163154a8e0754017493355c139e6bb56d921c6131878689b35e01eaa469d3
font_02_sfnt_off000120b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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