Malicious PDF — malware analysis report

Static analysis result for SHA-256 16868e93de1fd170…

MALICIOUS

PDF

42.0 KB Created: 2021-06-26 07:51:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-24
MD5: 2e6a7af36dbb4ce1e192abe3ab0d6388 SHA-1: 210635fc047182c5172950ff568aca204a0d02b5 SHA-256: 16868e93de1fd170e5122fd9cb7df9fc6477e6eaa9b0aae5e4ccd377c4ddbe67
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 and uses an image-based lure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7020

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 42 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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
  • 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://irlanc.ru/uplcv?utm_term=permission+letter+sample+for+research PDF link annotation
    • http://yjsyrj.com/userfiles/file/81519573675.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/wuxumib.pdfIn PDF document text
    • https://fruzsiflame.hu/userfiles/file/3054600384.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/basepaxopene.pdfIn PDF document text
    • https://betenrealestate.com/sites/default/files/file/xavusuvipekikele.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/1d3c14b92949fe806148488f4f68aa68/nuroworurevoveruxokoge.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073fc7d15872---lafuva.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c51353df2---vuridazuvebabot.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/45725554660.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b97731a15f2---21044231555.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/ad1e03d3cfd7bc26c0a6555bd41f587f/76707395050.pdfIn PDF document text
    • http://biolabsrl.org/userfiles/files/80729699657.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b10dbc56fa---puzumupaxixaverasovuzut.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/76525018424.pdfIn PDF document text
    • http://cityhigh78.com/clients/2/2d/2ddbae4fb74c169819b3574d76e4e264/File/dovakipajuxanugibatef.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/2ccebefccb86139cd85936bfeb0ef1c7/kigufipazokural.pdfIn PDF document text
    • http://dlikefulproductions.com/clients/875850/File/9826356491.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/ul593rc2tu6bnpisgltockghh9/gawigizogaliwuxu.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/23158546140.pdfIn PDF document text
    • https://mygenius.ru/admin/ckfinder/userfiles/files/ripoge.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ec68d7e63---50351264934.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/3484424826.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/35648710033.pdfIn PDF document text

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