Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c87f6fea855d723…

MALICIOUS

PDF

85.0 KB Created: 2021-09-06 01:03:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a2cbfdeb6f189c635e4db4656eeabf2d SHA-1: 478cd93a06028e2690136db5ce4fe985a36e721a SHA-256: 6c87f6fea855d723408ce7855aaaa94720a65b45a9379cea7b8c7d09e767bb6c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links to external websites, many hosted on compromised CMS uploads or disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no further context on the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089707e082c5---45587215199.pdf In PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/962fe48fc37e0a94743e23d13a4a96c4/55753636011.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/levatiwudivunegumakani.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16079c6bee2ea5---38549597030.pdfIn PDF document text
    • http://urduhadith.org/survey/userfiles/files/muvegojirewibixifijo.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/2842999273.pdfIn PDF document text
    • http://kondicionery-shodnya.ru/upload_picture/file/kepiwibutizudigutilat.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/44617481415.pdfIn PDF document text
    • https://yodishit.com/uploads/userfiles/file/komiragurijukabo.pdfIn PDF document text
    • http://taiwan-tsai.com/upload/files/70442065876.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/8f758fae4d908875ac78cbaec0438d4f/jexafolomaranaki.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/917bea7bf1483bd0b0ae71070e93c78f/8908532544.pdfIn PDF document text
    • https://trungtamgiasuhcmmq.com/uplaod/quangtri/files/37861682125.pdfIn PDF document text
    • https://portugaliaimagyarok.com/ckfinder/userfiles/files/wimawikejofonuwogaw.pdfIn PDF document text
    • http://famillespourstarlight.com/clients/a/a9/a9b42c05011d3bb27e7f7ec2ed30324f/File/40014824968.pdfIn PDF document text
    • https://hgb.se/filer/file/29883813648.pdfIn PDF document text
    • http://chornakorn-packing.com/ckfinder/userfiles/files/gejulebu.pdfIn PDF document text
    • http://scoutpate.com/userfiles/file/sewubaremolejokonaduba.pdfIn PDF document text
    • http://toonesk.com/upload/3103036490.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/20200978618.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/tikorukewudabubidor.pdfIn PDF document text
    • http://blesk-stroy.ru/userfiles/files/87196965003.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ad95c2ed3---63688441847.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/kares.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=rocking+horse+winner+summary+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_off0000e1fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1FC 11360 bytes
SHA-256: 2c3f352ff784573109705f4c534e02b57b439a2c4eb1f6329a22b083b836607c
font_01_sfnt_off0000fc72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11484 19040 bytes
SHA-256: 831a8b2e6e7940df14ea51fb5b46b94a8c6bdad5f704d37c031c80ff57e24070