Malicious PDF — malware analysis report

Static analysis result for SHA-256 66ff2913afce2256…

MALICIOUS

PDF

83.6 KB Created: 2021-07-13 17:46:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 7f2740ee53a4f623f9f39d5887872ce4 SHA-1: 09ac592568e6f9d0d6111171e929cd8c9ab99b51 SHA-256: 66ff2913afce2256a9ebae4b0b5314d29ec492ce9c57d168a49d4c43780b1a21
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for SEO manipulation or to serve phishing content. The document body is heavily obfuscated and does not provide clear instructions, but the overall structure and URL analysis point to a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://asirius.su/wp-content/plugins/super-forms/uploads/php/files/07a47edaa99b51cfa88a3b508709d338/59754334196.pdf In PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/71047828507.pdfIn PDF document text
    • https://sanvexe.vn/webroot/img/files/zumarusig.pdfIn PDF document text
    • https://jin-ji.com/upload/files/14923730582.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/80b22d11633adbf334c45cb0dd30a836/21655422423.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e391815b422---fodofijadudosufupe.pdfIn PDF document text
    • https://beautydiction.com/ckfinder/userfiles/files/48778810027.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160da29125e167---37520272820.pdfIn PDF document text
    • http://gpe-el.pro/ckfinder/userfiles/files/33360006472.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/saxexopujutabugokukekeri.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc953358b7---wagotej.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/wisujusu.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/27b729da628c91eb48177b5aa138cfe1/junolasilarigil.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/67119675.pdfIn PDF document text
    • https://elitstroycraft.ru/source/file/67465969598.pdfIn PDF document text
    • http://euroteam.vn/ckfinder/userfiles//files/garanopiwenewupemuzuk.pdfIn PDF document text
    • http://donleroy.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tadiwotaxonezafovixupul.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/xojib.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16080b512764c6---dobubadefaxixamogu.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa9e73f628---sizarilexenovezupodukika.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a2472974729---zatagajukewotonadotif.pdfIn PDF document text
    • http://porpora.biz/imagenes/imagenes_contenidos///61540715686.pdfIn PDF document text
    • http://dlzj.net/upload/files/20210611010035249190.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=php+to+pdf+libraryPDF 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_off0000e49a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE49A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fcb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB1 10444 bytes
SHA-256: 425b3cd5009ccefd31207d481e3182c7850866ec5a83971d8d4d7485268f8e2f
font_02_sfnt_off0001143c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1143C 17256 bytes
SHA-256: 866c858a793f277173cca1b1cbdde3d7fc5f614f9eadb0f4a5fed1aefe2c155c

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