Malicious PDF — malware analysis report

Static analysis result for SHA-256 da810311ec9e52b3…

MALICIOUS

PDF

75.1 KB Created: 2021-09-01 10:21:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7a1c5c3e5eb49c1c920a9f578afd7945 SHA-1: 3381dc7a45a5c0adf41ab701bf50b39f55a57048 SHA-256: da810311ec9e52b37efb54c92612130efbd4685d0e0a33a67b2b1d697d3ee3f9
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple URLs hosted on compromised CMS platforms, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. No scripts were extracted, but the structure and embedded URLs point to a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b8ddc426c6d---jukemajavezuzunuxijab.pdf In PDF document text
    • https://p1gtac.com/uploader/files/xirawotimoku.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/2b8e28521208284750cb12ecc0d460d7/dawudoxuzifozuzenokon.pdfIn PDF document text
    • http://solee.cn/ckfinder/userfiles/files/wubedigew.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ee2ac699b2e---18467147657.pdfIn PDF document text
    • http://zpkprzemysl.pl/ckfinder/userfiles/files/39152471039.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebce004188---88742000115.pdfIn PDF document text
    • http://studiomontironi.eu/userfiles/files/bogosujotoru.pdfIn PDF document text
    • http://lawfirm.vn/MINH/user_files/file/9615658513.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/369d7ccef28a419a691f9c5231cac6fd/zozekorav.pdfIn PDF document text
    • http://lex-ter.ru/admin/ckfinder/userfiles/files/33620308703.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/93dbf53a7b6280a3a8d3c926d9720826/wegoj.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16091ab2b45a8a---sanenulupe.pdfIn PDF document text
    • http://estatepie.com/files/userfiles/file/joxedapamitenatuwuxejuva.pdfIn PDF document text
    • https://rhuyscampingcar.fr/images/files/ragamog.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16073a92248c3b---zuwim.pdfIn PDF document text
    • http://sam-global.info/files/file/92360303826.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/25950690484.pdfIn PDF document text
    • https://kartplast.com/resimler/files/33837846781.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16084ec79c51ad---jedonumivakinifip.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/f99ed5ba5b7172ba5d4dbf733a90a8a6/10021368031.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/161217c560746c---17825880216.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/9ad6227e4b9c7e2fbf6effd6af3fa832/14430001680.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16092de5d7e6d9---pefexenizusutajeweja.pdfIn PDF document text
    • http://e-hane.com/files/jilosonuvevur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=usa+olympic+wrestling+teamPDF 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_off0000c13f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC13F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d951.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD951 17180 bytes
SHA-256: 83d0344b360c7e036bb503b97355478537332ba1a8bceef8ed9c46168bcf0497
font_02_sfnt_off000105cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105CB 10924 bytes
SHA-256: 2541e95d8047b9da2895d4014bf5608390412916177f58acb33b71b5171dad6f

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