Malicious PDF — malware analysis report

Static analysis result for SHA-256 8015af0fd6fc4193…

MALICIOUS

PDF

90.3 KB Created: 2021-07-31 18:45:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 1eac11b43b9cb297997eeb5bada785cb SHA-1: 9b0c1172835d5ad5878bd26b20f6e2fce5de1e31 SHA-256: 8015af0fd6fc4193a213b25f237b6353fe3c69d80d8657587ddb70378fe9ad50
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The document functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other domains, likely for SEO manipulation or to host malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/a1p7jkcr3tr10t6omm8ab0ju2o/jalotufujelojolufipeson.pdf In PDF document text
    • https://marljivo.hr/userfiles/file/83767073353.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210715161400.pdfIn PDF document text
    • http://vantaibactrungnam.vn/upload/files/35808530275.pdfIn PDF document text
    • http://chupanhnoithat.vn/upload/files/negujoxanarujekokem.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/98530072643.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/d77fe49dfdcb7b3041806a0bb12e0f61/navuzel.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b9e10ea5277---22493568910.pdfIn PDF document text
    • http://fishtech.org/uploads/userfiles/file/file/26466117431.pdfIn PDF document text
    • http://meyanko.com/userfiles/file///8159902869.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/99076778441.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd0f87ceb01---viposedagixe.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b59cf07629d---64956084239.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/0ecdfb16f8b1febd67471550d2b25a16/nagelekifoxe.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16079b9af7c44c---zuborejojok.pdfIn PDF document text
    • http://gamjagolla.com/uploads/files/fedorobibazabimuj.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/144392a15ae5fed4af798f0e17b0801c/vagara.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093450fbf8f2---xubozeronazi.pdfIn PDF document text
    • http://dejede.com/userfiles/file/taramokesofefawaduni.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608098f84ba12---24384922589.pdfIn PDF document text
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079cfb7eceb9---fubidute.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/zemenovigakakobavosola.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b0abdb458a3---suravexaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=statistics+tutorial+for+beginners+pdf+netbeansPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A6 11108 bytes
SHA-256: 0e7c4f54a8d84e99709c2eb3c237234878424245023bdfe50b315c9a2987c3f6
font_01_sfnt_off0001103e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1103E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12850 18300 bytes
SHA-256: 374d6a47907b6c36c1bc96d0cd1d6d35c9765c4dbbf11ec17611470e1555bc46

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