Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea77cd4a5db6b4e7…

MALICIOUS

PDF

82.8 KB Created: 2021-07-07 02:10:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: db59cfb5e03d09711b56bf1aa601f8d4 SHA-1: e87ded92de7b248adbfa256d497031afa5f9f0ac SHA-256: ea77cd4a5db6b4e7a8c1c473a99e86baf28d5696269275b5e76c2e0bc7cbe7be
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • 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.
  • 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://asfalon.com/__files/file/tanaji.pdf In PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16072d61ebffe1---10921095630.pdfIn PDF document text
    • http://fitviewer.de/files/file/34588872849.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/kulixiza.pdfIn PDF document text
    • https://schmitz.cz/res/file/jituje.pdfIn PDF document text
    • http://clasesholandes.com/userfiles/file/74202497244.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16199731326158.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6978d049d---nopakenuwagonitomobo.pdfIn PDF document text
    • http://score1forspencer.com/clients/4/45/4587145e2679cb7673d0e21b436e5c25/File/6535843515.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b757ca7c33b---fagusimarofovigi.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16082635e1e88a---27874197637.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/88298138230.pdfIn PDF document text
    • http://ddservice-bmw.pl/userfiles/file/gozoborawiruxe.pdfIn PDF document text
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/2911852962.pdfIn PDF document text
    • https://landi-bg.com/images/file/zosokinafigixobatubef.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/gitezigetuturam.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/47c13079dcf92925d9c2edc5afb3534f/45529559507.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/011010384649.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd0893fd36---43816331672.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/91685337531.pdfIn PDF document text
    • https://wkd-uk.com/wp-content/plugins/super-forms/uploads/php/files/2b66fe20fb99471d9d0a3607f12bc799/34757396136.pdfIn PDF document text
    • http://zuche0551.com/upload/file/fizaladokuxomepedaril.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=ctet+solved+question+paper+last+5+years+pdfPDF 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_off0000dfaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFAA 11084 bytes
SHA-256: 3998280e07dda0a42f13ecbf8b96a88e0a1499ccab6cf07c3050e0ad5193440f
font_01_sfnt_off0000f97d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF97D 16944 bytes
SHA-256: 56ed75aeee68d9ae9cdbd61a706fd5432288208d9dbd0b43d9c39b25e756d284
font_02_sfnt_off000125c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1