Malicious PDF — malware analysis report

Static analysis result for SHA-256 b873264e4d32df4e…

MALICIOUS

PDF

91.2 KB Created: 2021-08-07 05:21:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 574b9b4b126a17cc8c92d4a6275036ec SHA-1: 6512abb6462d38b2355f0f138af4fa3e724d4329 SHA-256: b873264e4d32df4e81f1a9e383fff254dd7cf54809a0c5d644c466bfbb72dc68
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous compromised WordPress sites, which in turn host other PDF files. This suggests a multi-stage distribution or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these linked documents.

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 http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160795b0340be7---jilapijelopatunodevumafa.pdf In PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/72f5a4e2510c5d4f2ab17a4b13bded1c/tudanilekogufeji.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/054a2370c800c64da2efa9e74d6ca702/jilegog.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/5632dd0a0bee4ddf07b18ecec665a34f/liman.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/sudedutititerilekekom.pdfIn PDF document text
    • http://el-system.jp/uploads/2012/files/netawarujifavovutonena.pdfIn PDF document text
    • http://manninareunion2012.com/clients/0/03/03b30fdf9aaeeba733afadbef254ff7b/File/sukopedirif.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/vogataramejevezo.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/60896930065.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/29878817957.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/99c7d6ce8e8befdb7c3152e1c311c140/dujutezolafikulixojej.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16085e8b265987---verizem.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e86bf74da9---figilosolosobeposom.pdfIn PDF document text
    • https://egyseg.eu/ckfinder/userfiles/files/vekojuvowisuvomuwebux.pdfIn PDF document text
    • http://xn--12cbg9dihj7egda2g6a7dceb1d2cp4nvgf4f.com/datas/files/74039378237.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/imhrcplsp3n8bag78r3113g761/1193056240.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__60B1FCC1E83A1.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16078c283ea198---zemavojujoxavumavafotixi.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3531e48cf---vuvazisa.pdfIn PDF document text
    • http://clubmaniacr.com/campannas/file/nafig.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608d359f3fb6f---29087676498.pdfIn PDF document text
    • http://pc75.net/upfiles/file/1627270340.pdfIn PDF document text
    • http://italiangreyhound.pl/img1/userfiles/file/36614896971.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/rumizipej.pdfIn PDF document text
    • http://hanasushi6.com/uploads/files/zekumabuxuvavevukanu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=skyrim+mirai+mod+walkthroughPDF 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_off0000fd97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000115ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115AE 10756 bytes
SHA-256: 417272577cc7a9a037ec5a12cd14fd6d93842a19d905f0c037127bd9e441ce91
font_02_sfnt_off00012e40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E40 19120 bytes
SHA-256: 304de2227fb962a3bce61073bcfe5ede5dfab08b58009097dfba12a8dcc94f04