Malicious PDF — malware analysis report

Static analysis result for SHA-256 61455050ae063316…

MALICIOUS

PDF

84.3 KB Created: 2021-09-07 13:07:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0fac5045a896dd13dfa3823e0ee38399 SHA-1: 30db236dbae56ee360d3bce053aa8ae4dccf7ef6 SHA-256: 61455050ae0633164b5e16cca83f00f905ead559dd284b87625622bf4d64779d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it's a link farm pointing to compromised WordPress upload storage and potentially used for callback phishing. The document body is heavily obfuscated, but the presence of external URIs and the 'SE_CALLBACK_LURE' heuristic strongly suggest a phishing attempt designed to trick users into calling a fraudulent support number. No scripts were extracted, but the PDF structure and embedded URLs are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://crewmak.ru/uplcv?utm_term=geberit+wc+frame+pdf PDF link annotation
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609456b857114---vevafuviwenimaf.pdfIn PDF document text
    • https://gea99.com/ckfinder/userfiles/files/78997883194.pdfIn PDF document text
    • https://unicornccc.com/ckfinder/userfiles/files/13978871999.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/kibekavatovibugeleza.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e01ebcc8a---pirokuga.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/922b0db3edf4a0a688611ad5316dd2eb/pojigoneruzer.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16074d63a392c8---duwivek.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/i4u2if4j9cgb9rmumqtn221bc3/13690450687.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/62886098243.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/9989cc52c67a3981e402c4ed2211757a/vebefafuguxumuduvus.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/welareditobifivorapoda.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610576edab0cb---lewodusiwopitixulivalofu.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/d596b0c444ccee215293ef6d42e37d10/7861177434.pdfIn PDF document text
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/zedisoxuzaderefovusekifu.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/niu7fmcjkthf7j7509nl6f4f8d/rosarugawuvege.pdfIn PDF document text
    • http://weorderfood.com/uploads/files/43648411115.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/50969637026.pdfIn PDF document text
    • http://we2meeting.com/ckfinder/userfiles/publics/files/743809055.pdfIn PDF document text
    • http://www.gulbaharsigorta.com/contentData/file/64573462602.pdfIn PDF document text
    • https://ketdoanbus.com/webroot/img/files/bifetosita.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/93298739707.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/xebusolixuwo.pdfIn PDF document text
    • https://nenanhduong.vn/Upload/files/80762446448.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_off0000e74a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE74A 10608 bytes
SHA-256: c24d616f5b10d4b792bf212b3a26bae3f95ec442796383960f8a0bd276b1a505
font_01_sfnt_off0000ff6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11781 17000 bytes
SHA-256: 73e3b80ab07ebb462a01b3d38f08152c2e9182d0463b570c75dda34c33e1d263

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