Malicious PDF — malware analysis report

Static analysis result for SHA-256 62b1afa91e0c8eea…

MALICIOUS

PDF

120.8 KB Created: 2021-08-23 19:08:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fd57eb80eae840d8f64d9b86e135aad9 SHA-1: 9aba807ec42f2928f780c218e55c986aa25c9161 SHA-256: 62b1afa91e0c8eead7aaa07acd3960d094f5dd9db576164b2357b3dcaab0473b
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that point to other PDF files hosted on various domains, many of which appear to be compromised CMS upload directories. This suggests an attempt to distribute further malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9735

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://transportdiverse.com/uploads/files/26350083128.pdf In PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16101136e54ad6---845991638.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/ec2e23c27fb7e6e76f12b38e8cc7645f/birugota.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/eab0e516b329a72973a5cf4183084097/59930668887.pdfIn PDF document text
    • https://baongochoa.com/upload/file/mazudexanuvodebukowavig.pdfIn PDF document text
    • http://xn--80aejmo0alc.xn--p1ai/ckfinder/userfiles/files/voguziniwubidobuwoxokixex.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/4872852073.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/d7ea1043fe67c6db706e8608392ae46f/kogodaxaditatakob.pdfIn PDF document text
    • http://nt-module.ru/ckfinder/userfiles/files/1749940531.pdfIn PDF document text
    • http://doubletroubels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a600e37b46---dizerenulumemubawujatet.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160887a2789f12---fekawabugelug.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16120914c3dc44---zubijusemazus.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160762606ed9cd---zatatilepuzevinexilu.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160788d53765ba---16179220621.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/lizix.pdfIn PDF document text
    • http://studiorestagno.eu/userfiles/files/15932395808.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087cb5b7f2f2---pedunu.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/15912712210.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/gozoxiledenur.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c85a240649---jusipojixibiwagofek.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/e1a5109803cf8c04157de5317fd10086/tapafakolipaxoso.pdfIn PDF document text
    • http://sunnyten.net/userData/board/file/70415802148.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/lobatexeputuxeluniwa.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16108b22f20ea7---matonawazumakaneranuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=jontron+fool+me+once+quotePDF 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_off000174e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x174E4 18148 bytes
SHA-256: 2f10d6d0bb0c1522918cbc2a32d1d57c253ab73ec50a30d90924c3e9cbf427d4
font_01_sfnt_off0001a4a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A4A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001bcbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BCBC 10312 bytes
SHA-256: 9cbc8fd3624451bb9e224e95e7c46bc55a6ed778df9e900fc287130b5f1f9f1d