Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c078356888892b7…

MALICIOUS

PDF

87.9 KB Created: 2021-08-13 22:37:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: d363bd05445fd650b94a7f8669c3b209 SHA-1: 1536c3d0d2d0a021ad805bd58bd6eaa3e7817f29 SHA-256: 5c078356888892b7639a99f75d7ecfe3b18595aff0d645fe1095631c329393e1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a link farm pointing to multiple compromised WordPress upload directories and disposable hosting sites, suggesting an attempt to redirect users to malicious content. The embedded URLs and the nature of the heuristics strongly suggest this file is part of a phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://boyanbolyarski.com/userfiles/file/58570116670.pdf In PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b40293c68ee---2858810306.pdfIn PDF document text
    • https://ventadeterrenosurbanos.com/userfiles/file/jagaxibozeridimewe.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/06eac9c8c438b5602b258139d9fdd9ac/mepilok.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/afa25d49a5b6bbd62218bcf7a3802677/62752440559.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/718ba26647cbf9c00cbc9a57c0fd9d7c/43970600162.pdfIn PDF document text
    • https://marblo.com/app/webroot/img/files/12115859101.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160780dec190c1---zetubusenabujiga.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/1857eb1a2efce4a48724f5db093981b2/rakebanosedodeliwipivu.pdfIn PDF document text
    • http://poddertradingandindustries.com/userfiles/file/68173364380.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/4t073vgie3adggndd63to6fto0/632240043.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/5429bd9aa1251d7b8b3d203cc66b4856/suzezegupa.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/07ae6a5b4df92e64e065b3ff1fe85fc4/55187060668.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16115321a4dee1---kagigepozupuger.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/96840162093.pdfIn PDF document text
    • http://elma-itc.ru/!upload/files/pugazumukurafe.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/a3a81b1d5ddda48410614d94e23d60f2/pijumedawudofogafazabimik.pdfIn PDF document text
    • http://614move.com/clients/4890/File/wibugonugebusarabuzujamuw.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ae0e7e745---60858205542.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9053f3810---rarusobugemexuv.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/wisumewefipujatutuluj.pdfIn PDF document text
    • http://esistore.de/userfiles/file/35175693702.pdfIn PDF document text
    • https://biocoop.legreniervert.fr/ckfinder/userfiles/files/rirapevujafibogamaxokix.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/1lnog75lrnbmhlkn0jbvn1c9m4/zepewineboweziwir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=financial+statement+analysis+and+security+valuation+solutions+pdfPDF 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_off0000f28c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010aa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA3 11040 bytes
SHA-256: 4eb314f9d62d39c60c9d7a6ae4874c9e19eb7677933677ec31b5786eaf0ee000
font_02_sfnt_off00012450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12450 17132 bytes
SHA-256: 1d6ea40d43533d5248b3a1d847e047f35409148a6a2c7ae21fa20f9c42d5194b

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