Malicious PDF — malware analysis report

Static analysis result for SHA-256 f406d5110346c936…

MALICIOUS

PDF

88.4 KB Created: 2021-09-12 18:24:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a3a81ebb4de128e2143c298ddf253fe4 SHA-1: 044e7644090582dba6965fe568be7071e338605e SHA-256: f406d5110346c9361333e54db60a8f482bde6d31d4283d7ef2c25a802784c0c9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs pointing to compromised websites, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document's primary function is to redirect users to potentially harmful external content. No scripts were extracted, but the overall structure and URL distribution strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://jumpinfit.it/userfiles/files/64573733696.pdf In PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ecf15d2b68---dafetupilitakimesopisasa.pdfIn PDF document text
    • http://morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161328f747e3a3---roworasusesinivepemuguru.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/xapefilejuvupanibusiwota.pdfIn PDF document text
    • http://aibasavar.edu.bd/app/webroot/ckfinder/userfiles/files/bizokep.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132872295b5e---sezotuzumigibabojebujatav.pdfIn PDF document text
    • http://theclubburger.com/uploads/files/penoket.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/kedufepepawutakuzopow.pdfIn PDF document text
    • https://blokhol.com/upload/files/rasilafixojamiro.pdfIn PDF document text
    • https://spandoekland.nl/userfiles/file/25768259584.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/vuwomubunowozotewosaleve.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161325bbfc4738---51513757604.pdfIn PDF document text
    • http://sumbulefendiegitimvakfi.com/resimler/files/84365402348.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/dib9od66jjaclpm3huhd4hvptu/30732225264.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/katutogitesozo.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/40021365686.pdfIn PDF document text
    • http://ekhoron21.mn/uploads/files/95348721907.pdfIn PDF document text
    • https://robustbrakes.com/administrator/imagetemp/file/gobaviwuxutexarilelapodi.pdfIn PDF document text
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20210902_152053.pdfIn PDF document text
    • https://timminsrenovations.ca/file/tgUIyq9AK0iHUZKi.pdfIn PDF document text
    • http://rakkhunnursinghome.com/user_img/files/jatubomefoxedolar.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d25159018b---zagadepafir.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/161356c34da518---78577207574.pdfIn PDF document text
    • http://truhlarstvi-strakonice.cz/files/file/22613475062.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/xuruzexenemep.pdfIn PDF document text
    • http://vietsaovang.com/uploads/userfiles/file/10636804249.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+disable+the+recent+apps+button+on+androidPDF 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_off0000f54d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D64 10928 bytes
SHA-256: 3cf29cdd4362a71475efb4951a7a4dc8a2d332a723e0cd7f44e417b1b55ed77d
font_02_sfnt_off0001266f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1266F 17216 bytes
SHA-256: 55a589160f8d64fd959d15ba1ab2e731fea56e73a4f7d198f25e172eb1b26194