Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcffbc22b396ef78…

MALICIOUS

PDF

81.8 KB Created: 2021-09-03 22:53:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 292542e20a49761000ebbfb97c5aaa7b SHA-1: 9d610adf3c4c41e5b7eab87f9ddb0c64efc8e84b SHA-256: dcffbc22b396ef78756d05ea38fbd645dba8f303a5a2dd8bf2620fa0a34f3e71
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 0.9977

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 https://huntic.ru/uplcv?utm_term=how+to+use+prepositions+in+english+sentences+pdf PDF link annotation
    • https://www.mftelhas.com.br/adm/Editor/ckfinder/userfiles/files/wominuvedowakomagigosir.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//zijexine.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160846cab6e430---44839621046.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b43ade29eef---4993831215.pdfIn PDF document text
    • http://carbontuning.ru/file/zekujokebipobi.pdfIn PDF document text
    • https://hoatuoi360.vn/uploads/files/dewupimopezuvorolevux.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d6aab4efd---fudokitime.pdfIn PDF document text
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fudajodugotafujizuzuvobit.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/82113553631.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/8k9lb3vv9tsdfp56anffbl45i6/4620420534.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/90406097552.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160e51bca96e8a---lisofuwamabesesukunu.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/zulisoxumofasimavuba.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/sadnqiigm13f4jm9jici35iba8/15449473667.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/21863057701.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/27ad583e396b50322625cc1502cd1c1a/35221372107.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/gobujozufad.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c85aadcff0a---davujam.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/37539879997.pdfIn PDF document text
    • https://adeptos.clevercloud.pt/images/items/files/vosusifum.pdfIn PDF document text
    • http://sonkertrail.org/clients/9/92/9260a3c387aed4615f72c72c3a1da295/File/95580808245.pdfIn PDF document text
    • https://rmp-traueranzeigen.de/cms/files/razezo.pdfIn PDF document text
    • http://sbairs.com/datas/files/23173071768.pdfIn 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://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_off0000da72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA72 10912 bytes
SHA-256: 1e6eca668451bc4d8d96112bbcce132af98493ba78d36bfce9d7f7dda8d563eb
font_01_sfnt_off0000f370.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF370 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B82 18284 bytes
SHA-256: e80154afe4333c293891f748966b699cc20b4db1b01aed229810f3c01056969d

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