Malicious PDF — malware analysis report

Static analysis result for SHA-256 88e45fef5c26d10f…

MALICIOUS

PDF

80.9 KB Created: 2021-09-19 23:27:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 38c58e87bf51502f7e69885fcef59dd1 SHA-1: 243130d47ca5777ddfb9c1a98a5216829e55d85e SHA-256: 88e45fef5c26d10f2464ef2df4d8196b8ca57cddf46f33d4227c6c4ad8f000f3
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' lure and callback phishing elements further indicate a social engineering attempt to trick the user into downloading a payload or engaging with a scam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://philabc.ru/uplcv?utm_term=recordable+pro+apk PDF link annotation
    • http://fasson.vip/images/editor/files/fumutikuvun.pdfIn PDF document text
    • http://ginzaoakland.com/uploads/files/27686452761.pdfIn PDF document text
    • https://volandovia.it/public/fileeditor/file/xurivuxago.pdfIn PDF document text
    • http://www.bsa.by/ckfinder/userfiles/files/noporoguwub.pdfIn PDF document text
    • http://kubkao-kubpla.com/userfiles/files/fowanosajawofezulibew.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/vifipo.pdfIn PDF document text
    • https://motoquadro.de/userfiles/file/38319566335.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144c5d469b62---wijofowitudapekixexijo.pdfIn PDF document text
    • http://ybshajiang.com/userfiles/file/2021-09-06/210906201754501587umyml7y4vcfn.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131679c86e9f---40482355840.pdfIn PDF document text
    • http://holland-ex.com/images/blog/file/17912917057.pdfIn PDF document text
    • http://svx.su/ffile/file/wexukipanizekudesas.pdfIn PDF document text
    • http://encino.ilovepokebar.com/uploads/files/fovefe.pdfIn PDF document text
    • http://sgrappresentanze.eu/userfiles/files/67076811099.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb51180744---16521663780.pdfIn PDF document text
    • http://rapet.hu/files/zaruwejaxubirubamakomozid.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/93986871057.pdfIn PDF document text
    • http://hoanhaochemical.com/uploads/files/9801702756.pdfIn PDF document text
    • http://devitohomesorlando.com/userfiles/files/nufiwabamorom.pdfIn PDF document text
    • http://wdnederland.nl/file/37257071401.pdfIn PDF document text
    • http://chaputlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pujapijisulajenaxa.pdfIn PDF document text
    • http://herborgthailand.com/file_media/file_image/file/dajuzugigutawamujutoxes.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138e0ec67f7d---bevaduwubunuzerivibulipi.pdfIn PDF document text
    • https://tekartltd.com/upload/files/dixutelasidovomonofuxup.pdfIn PDF document text
    • https://tutorlookup.com/ckeditor/ckfinder/userfiles/files/riwavufog.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_off0000d32c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD32C 19812 bytes
SHA-256: c5e0a2f1e0e36aa475a479efddbd617769f6dff136d9ae179148db00e969a61c
font_01_sfnt_off000106ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106EF 10320 bytes
SHA-256: cc323e9af1fbde9406875740f8a04e8d38c4ae1d9eadedbaff28ae6188c8b936
font_02_sfnt_off00011e11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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