Malicious PDF — malware analysis report

Static analysis result for SHA-256 de5934cfe355bbd9…

MALICIOUS

PDF

90.4 KB Created: 2021-09-18 09:04:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 755804acd7e924bbab35deb7ccac5c1c SHA-1: d9022ad49e17ce2f74b0823ea75803878e4404ce SHA-256: de5934cfe355bbd952ae5b523f36a7b498f5d41899e3d366e45eee91368cb4db
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file 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 external URLs hosted on potentially compromised or disposable domains. These URLs are likely used to distribute further malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://irlanc.ru/uplcv?utm_term=application+pour+android+gratuit PDF link annotation
    • http://interface-referencement.com/userfiles/file/15923913164.pdfIn PDF document text
    • https://dpt-mh.com/uploads/news/files/ronujidipovazunaduxar.pdfIn PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/23081445506.pdfIn PDF document text
    • https://zerling.eu/nico/images/files/13286446224.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613525b633ae9---1489090648.pdfIn PDF document text
    • http://londonjip.com/userData/board/file/83155250659.pdfIn PDF document text
    • https://marblobath.com/app/webroot/img/files/32117384129.pdfIn PDF document text
    • https://liftsystems.ro/LiftFiles/file/582148797.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/otn703gj37a3kn2i5r31d06j5e/83743786340.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614096e028444---didikudamiwatiwop.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/82963619796.pdfIn PDF document text
    • http://gardens-spa.com/user_pict/file/susevifidokizimom.pdfIn PDF document text
    • http://2015.letnifestiwal.pl/ckfinder/userfiles/files/giluxuka.pdfIn PDF document text
    • http://artemon.nl/userfiles/file/2283361263.pdfIn PDF document text
    • https://hkfew.org.hk/ckfinder/userfiles/files/93225635098.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135a4f29753e---fomadapaz.pdfIn PDF document text
    • https://nisahanpin.com/calisma2/files/uploads/11505967560.pdfIn PDF document text
    • http://studiomarazzi.eu/userfiles/files/xosaturijezujaxapo.pdfIn PDF document text
    • https://apra.pl/files/file/3004437703.pdfIn PDF document text
    • http://zuche0551.com/upload/file/97344794355.pdfIn PDF document text
    • https://mehfermobilsaglik.com/userfiles/file/nogulat.pdfIn PDF document text
    • https://romalasergroup.com/userfiles/files/15871974684.pdfIn PDF document text
    • https://elearning-chemistry.ro/userfiles/file/1925747794.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_off0000f5e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010df5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF5 20896 bytes
SHA-256: ad5c21a9429e7d5e70e4133ef7426c0b27bb1556bac82ff96ee002c72c1c704c
font_02_sfnt_off0001426e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1426E 10468 bytes
SHA-256: 205eb4703b309e9df0f2d86f25454321b60fe9a3b32997cc8466844073299f33