Malicious PDF — malware analysis report

Static analysis result for SHA-256 827db1b3bf1ed66e…

MALICIOUS

PDF

86.4 KB Created: 2021-08-21 19:11:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2904d1d838e9949276706a9b19877fe6 SHA-1: 78793a0f99c2625eaae64f68ad175c61ffdd6200 SHA-256: 827db1b3bf1ed66e1093101bf04d60695417a9394e07739cfc2d783ab32c6d5b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. The PDF contains numerous links to external websites, many hosted on compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the presence of PDF-specific heuristics and the overall structure indicate a likely attempt to exploit users through malicious links, potentially leading to phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 http://carefirstwalkathon.com/clients/8/89/89514deb4c0e8807eb046cac28c4977f/File/tazutabojinir.pdf In PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c34c8691aa---kijopeputoxurizobera.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/028af9f0726d85bfd1cd8651ebde7a7c/napedojikoje.pdfIn PDF document text
    • http://braghieriarchitettura.com/userfiles/files/15076873920.pdfIn PDF document text
    • https://webmenuplus.com/images/file/nepotiweputili.pdfIn PDF document text
    • http://kjphotocon.org/data/userfiles/files/41349227730.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1610d168758770---76938965070.pdfIn PDF document text
    • https://senesi-sklad.cz/userfiles/file/mebabunasiwuwivofaje.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210501172929.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/k2ps20ais4tl6itebo1a55h0cd/dakiwujulezuti.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/fezeda.pdfIn PDF document text
    • http://www.kowel.com/ckfinder/userfiles/files/1629320623.pdfIn PDF document text
    • http://josephfellerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/25954601804.pdfIn PDF document text
    • http://pi-consulting.ch/download/93007494137.pdfIn PDF document text
    • https://telenovella-bg.com/files/36908564435.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/si7qaj8q8lnrapkrqm8mt29h75/5721194727.pdfIn PDF document text
    • http://jirehenl.com/userfiles/file/020706062159.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a55ea002b65468bd104670dcda68241f/dozejisaxozotezewisili.pdfIn PDF document text
    • https://hagepoorter.be/files/files/74822441346.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/95143105327.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/n1g8r48r9gpp3tjogipda24csq/fidamatogexotuvubanoru.pdfIn PDF document text
    • http://pjzhengwang.com/upload/file/20210801_140003_144.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b92f001f506---14302465801.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=distance+and+midpoint+map+activity+answer+key+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_off0000e98c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE98C 11096 bytes
SHA-256: 4ebf51d8dad485580bc6441478cf6299dc4475d9e18068b3946b12c46c2ee34f
font_01_sfnt_off00010382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10382 17756 bytes
SHA-256: 55c22f67b5070b2dd4d9478eadc1a494489a297aca4e0456325f0e5e82fb241b
font_02_sfnt_off000132b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1