Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c6097e39c8caab9…

MALICIOUS

PDF

96.0 KB Created: 2021-06-09 14:33:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 230f8398c1f037320328a1b280ba3557 SHA-1: 282cbea0457ce6541bf5d729f18b6574ca05fad5 SHA-256: 2c6097e39c8caab961c30c9d1449ac8cd6444ef0241580eaba7828ced26ac9d6
156 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crewmak.ru/uplcv?utm_term=all+my+sons+full+text PDF link annotation
    • http://learnazia.com/fck/imagesfile/40678663827.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/53666605817.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ddc0da1b2---lesawarozekimubevova.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc7bca1e5b---49537520891.pdfIn PDF document text
    • https://victorybear-info.com/userfiles/files/43127918694.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e58d10dfd2---9788080519.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b28de2dcc92---41577524030.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/zijol.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/ximorifikavagogizepa.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/1ehtq13u1ahmaf72jephakgfh0/buxiwivawusinaxogir.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/wunagufezutot.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074122940f57---62655199842.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/uj5oadv1ljg3e77d1chu2sg7s7/17334059849.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf34a4c266---tifaroteluwefapowedimazu.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160874a8d3dcc8---89651379529.pdfIn PDF document text
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/fe6f9d36d42ac760df24bffcfd256fd0/kanoraw.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/07g0n3039310ptaiplto5qessm/55396795041.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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://scripts.sil.org/OFLIn 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_off000122ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122CE 4768 bytes
SHA-256: d826d33bae6b1cd473fa319b5f28b70cf722be100da5d1cefb5378fd4fada7cf
font_01_sfnt_off00013306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13306 11428 bytes
SHA-256: cb52a920a960c011181de426ca1c965f5270380103a8fea5c122ec69f42f1a91
font_02_sfnt_off000158fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158FE 17472 bytes
SHA-256: 9b2e163b9597c09d1f9e9d681484ad23fb5e4b87b088c3778cd79adef494ca8e