Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae9dd25dee12dc6e…

MALICIOUS

PDF

108.4 KB Created: 2021-06-15 19:57:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 5fa15ba6336c8790d9ca33e3f83f30e6 SHA-1: f5f523153bb066226ab9f9a3a241a8c106354313 SHA-256: ae9dd25dee12dc6eaa15c2a60324fe8b2db555b0603105ccf3b1d2d789b250d7
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.007 JavaScript

The PDF file contains numerous embedded URLs that point to compromised websites, many of which appear to be part of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple compromised CMS upload links suggests a tactic to host malicious files on seemingly legitimate but compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • 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://infrive.ru/uplcv?utm_term=health+journalism+pdf PDF link annotation
    • https://edcasys.com/ci/userfiles/files/75021665242.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/a97b241dadaac266c2888981fb141159/nuziwinafag.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/5372451ce68394b0d26b50b535b8dd73/bowegakisexurowa.pdfIn PDF document text
    • https://luathoanghuy.com/uploads/files/20545026775.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/m0oa12tstrtu7jrjvl04g25j4a/nezojetufaveg.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/89010754772.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d9af85e41---zonegide.pdfPDF link annotation
    • http://lacasedescaraibes.fr/file/63887678825.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc4230b764b---birijalinenonegubop.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/178hn3m2ju6hkjr21r8kr56naf/fasokasopaseroper.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b433f9e80e2---94858291619.pdfIn PDF document text
    • http://salinahighschool1968.com/clients/3/33/33fcb9b832a528c934b1ac42c6b88a99/File/vibixesubutevitif.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c746c1bb63---76729356831.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/kekasumuxux.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607360c6baec2---31537068858.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/607862fb0d1c93aeadce53fe57b1c63b/74511680726.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0d4ab02b62---pafidamiwavukij.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/15df31fd171b7d862a67983bae345c80/62888326048.pdfIn PDF document text
    • https://tsegypt.com/file/99375342155.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn 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_off000153c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153C0 5320 bytes
SHA-256: fab4eb9ac346ec608bfc62e83264f90f3d19b08bdbbd29d510d36bf6ec31626b
font_01_sfnt_off000165ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165AE 12828 bytes
SHA-256: 2816038724899e9ced910f19f5168e7227f728ccdd301b0ae67950865321d83a
font_02_sfnt_off00018fa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18FA4 16060 bytes
SHA-256: 2173a1880e9f774f759393e7d0d28dda91d04d8a3eae6bea41b822770b343b90

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