Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa4d2d2eb17c5506…

MALICIOUS

PDF

70.9 KB Created: 2021-10-03 09:16:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 895326d811c17992426503c4c98e871f SHA-1: aa8ac80d3914aad6c275d172035cd6eb937560c5 SHA-256: fa4d2d2eb17c55066c0edcb8555f59b36266063bb7d749267057d3eee0b5a0ee
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by a machine learning classifier and ClamAV, with heuristics indicating it is a PDF link farm and a callback phishing lure. The document body is heavily obfuscated, but the presence of external URIs and compromised CMS upload links suggests the file is designed to redirect users to malicious sites or download further payloads. No scripts were extracted, but the PDF structure itself is being leveraged for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://catamma.ru/uplcv?utm_term=how+to+find+point+estimate+calculator PDF link annotation
    • http://petukmahaaaraj.com/userfiles/file/22361636046.pdfIn PDF document text
    • https://www.whoamiandwhyamihere.com/ckfinder/userfiles/files/walisuli.pdfIn PDF document text
    • http://weforyou.it/userfiles/files/xawozu.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210906_124412.pdfIn PDF document text
    • https://polytex.de/sites/default/files/23793335443.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/sodulifuvorukafa.pdfIn PDF document text
    • https://2winit.com/Files/files/mojimonu.pdfIn PDF document text
    • http://sinocelltech.com/filespath/files/20210913175921.pdfIn PDF document text
    • https://www.syria-report.com/sites/all/libraries/ckfinder/userfiles/files/55394544413.pdfIn PDF document text
    • https://riwg.in/userfiles/file/80219897113.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16148ad175d470---kiluzozuvobupasesarefen.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/88522940093.pdfIn PDF document text
    • http://hungthanhauto.com/luutru/files/19244898073.pdfIn PDF document text
    • http://rfinshaat.az/userfiles/file/bupiwegebarogezo.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161543739bfaf1---98821355681.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ac8469fa3---noxujebudupukitatukase.pdfIn PDF document text
    • https://tadimtursu.com/image/files/83046205718.pdfIn PDF document text
    • http://studioassociatoemc.com/userfiles/files/74089780881.pdfIn PDF document text
    • http://moutierrozeille.fr/userfiles/file/55209542515.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f9b99409ad---foserusisa.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_off0000b23d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB23D 16820 bytes
SHA-256: ac43eb4323cd37a81090b29e960a3dafb76e7cfd7708174c05ec94644aa307cf
font_01_sfnt_off0000dc93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC93 10956 bytes
SHA-256: 9d863ffa7b1ac1d9fb380d337d1d78067a9cc053cde06416b9051feb59574bb0
font_02_sfnt_off0000f5f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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