Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfada91ed5e919cf…

MALICIOUS

PDF

94.7 KB Created: 2021-07-17 22:18:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: abf897329f0d15a89f8701d8a33ed225 SHA-1: 7ef8d96a4b051fbc9fc7f987411788aa1babc00d SHA-256: cfada91ed5e919cf94473d411a4049dd2a338daf303ee5d47bbc364615021a10
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple domains, some of which appear to be compromised WordPress upload storage or disposable hosting. These links likely lead to further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://kovosluzba-praha.cz/res/file/kokilumireliwobixosi.pdf In PDF document text
    • http://aldo-ins.com/userfiles/file/tipam.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c016441e876---63685267643.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbcf541115---28226179101.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/qreod6128gev9uh1h3rfjaggs1/184583980.pdfIn PDF document text
    • https://aravlicraft.com/cmsCart//upload/file/20011709528.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/45732644404.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160975fed47aa1---larazif.pdfIn PDF document text
    • http://stalmont.eu/userfiles/file/rofurunap.pdfIn PDF document text
    • http://dothi.info/images/files/kudedodobozajovizezobata.pdfIn PDF document text
    • https://ntct.dz/ckfinder/userfiles/files/kulezipi.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/82709642949.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/4835e2e6b25929b4936fd47baa7862e6/70983343824.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609506466cf23---82369331764.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c4fe7f32d69---39744769150.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/vulolom.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/joruliwewalemijijagobab.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/146f03398d52a3a868b7976fbf47a633/tajumetowaxesejawinewija.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b51833b202---ziwofofeguvalotejovo.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c1a64055fae---rividoxedusuzefolodinuwew.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/vakurusivesojabukege.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/6898b3f29d026a77c1f4ccaba62a80b5/niroxajumizopejebus.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/39425e843f9cc3fb9338a91d9891c358/wotewewa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=how+to+move+out+villagers+new+horizonsPDF 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_off00010eff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EFF 10856 bytes
SHA-256: b469787809af9f03b856e56b621c87e09900715d84b23da5790673baf22cccb6
font_01_sfnt_off000127e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127E5 17396 bytes
SHA-256: 79a3288a7be7fdb0d88bf26ff8b7e60a11d5489d45878402f0188f074c67f409
font_02_sfnt_off0001556c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1556C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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