Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea28ef447cabf2a1…

MALICIOUS

PDF

85.1 KB Created: 2021-09-04 02:44:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4b66c1b608e432cd8f8fb329b3437cb2 SHA-1: d0a4c3b015c45210eec0ac095474bb31bc193642 SHA-256: ea28ef447cabf2a15208043e8fc70217f2a0bf3f0019246036ed347ac9ad9daf
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-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 http://indianspringhomes.net/userfiles/files/pafisefitexagujuxen.pdf In PDF document text
    • http://axiomestates.com/userfiles/file/47687473168.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/72475248099.pdfIn PDF document text
    • http://clingac.es/d/files/luzunirobexavadune.pdfIn PDF document text
    • https://masini-de-ambalat.ro/images/userfiles/topidudepewiwudawu.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/ddd9a03a6517d5e7737bda053bf638b3/lisagu.pdfIn PDF document text
    • http://renovfab-menuiserie.com/userfiles/file/93415358410.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cffac50baf0---16198718177.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160819d8c37451---98147374126.pdfIn PDF document text
    • https://nhaccugiare24h.com/uploads/userfiles/file/semitojopev.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a434d0259---dakatizokaribixorokem.pdfIn PDF document text
    • http://lexen.ca/userfiles/files/98015294385.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5879b7cb97---76279907863.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/is36hdpbnr82qepqgsorbq2tgq/ropuku.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/66137993777.pdfIn PDF document text
    • http://contua.org/userfiles/file/15348413004.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/kuwokavatagakepukisizap.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd45f5432b---xagaxin.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/14212004072.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/d18b8f45ec659dfa85c1d8c8eb8190da/zuvutozofusununuzi.pdfIn PDF document text
    • http://haenuri.net/ckupload/files/90267952204.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/97i59vo3oep411klev9mcogov2/womulovomaduzopumuki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=manualidades+para+regalar+a+papa+en+su+diaPDF 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_off0000e783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE783 18192 bytes
SHA-256: 6eeec29db0dbeb12db430c6789fac1f9d565059f1c58a03f55ed9036fb9ff336
font_01_sfnt_off00011576.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11576 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D8D 10444 bytes
SHA-256: 26f5838a33f863dd86f9a88142d883ca93c69608ba8696ad019bc29b130b3f3a

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