Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dd9aa94f26267a6…

MALICIOUS

PDF

102.0 KB Created: 2021-07-03 17:53:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 5e4a175c22d7217286688bf07b7bc14a SHA-1: 08031c8366bc2aa39533153b0d38bf03daa8bd1f SHA-256: 3dd9aa94f26267a6d6177d0c36c2f10550639b42721e29fe948ff9b05a3cd13c
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farms on compromised CMS uploads strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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://queure.ru/uplcv?utm_term=third+rate+definition PDF link annotation
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/d7b273388b045f294f7ba5cb67ca7b72/numolufe.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a910cf198a1---sulodasoririverera.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160759af01d19f---wejotenabi.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/737c420c0d355f16bb0fb26bd369d2bc/maxavesinuxure.pdfIn PDF document text
    • https://gamasteel.net/userfiles/file/pawidoxojoboruziwa.pdfIn PDF document text
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/f1lg50sisuqtnls50r8v1ol5fs/dikofavotama.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/lezezidobudemiguxazi.pdfIn PDF document text
    • http://thetuckerfamilyreunion.com/clients/67950/File/pafufor.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/ce2emqeravo09qst841md5eclk/vodewepojakijidovojive.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/f3rac4luiga1jk1d0ue9kfms12/15182915716.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608852a572dd4---47812596412.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac734a20d5---lunizesinazilojuku.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609da2c3b2501---tewunageperexisane.pdfIn PDF document text
    • http://antonioruizabogados.es/userfiles/file/19530977358.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/e5da76107a89870b0f88509a4baf7b4a/94907680110.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/4586bf031d38db3ee72890ce959bc49a/gekazalopepefebib.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1607886c02ad77---lukajiwebifoledalirala.pdfIn PDF document text
    • http://gptools.net/userfiles/file/foxunakab.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/j0rkrb9p4o1r94843pg2lkt2mo/xupetejuminesatof.pdfIn PDF document text
    • https://mygoaltv.com/ipp/images/uploads/files/tulatefotala.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3b6a56e5b---54395807599.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf41170218---7324395749.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/ed09e67a6badcb975c880b69107ee126/tizido.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/jewugot.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_off00012e1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14635 10200 bytes
SHA-256: 8fcbfee60584d2e2f714960ff1d2da89a9cb3c613093c9dc8388bfde7e7fcfee
font_02_sfnt_off00015cf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CF4 17068 bytes
SHA-256: 0d04cafb3c8272b88946bdaa96f35fee9dcd05bb8061e5788cd6ffc7b3701897