Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5e605abd5aca5f7…

MALICIOUS

PDF

81.1 KB Created: 2021-11-12 03:52:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 435309869dbf88a6e9035962890a99b4 SHA-1: e847922cce43d303ec235d8075d03e44909ae71e SHA-256: c5e605abd5aca5f72f79abf85ee3b391c32ca0fea0a14896989c6d6c0f436c7b
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple external URLs, with several hosted on compromised or disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a deliberate attempt to obscure the true destination through a network of redirecting links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://opsir.eu/files/file/vugewarizubiju.pdf In PDF document text
    • http://thueotodn.com/uploads/image/files/beninoleluzorus.pdfIn PDF document text
    • http://jfhcoaching.nl/userfiles/files/62341731184.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/77637279379.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/2021925750585330.pdfIn PDF document text
    • http://hotelamadeustorino.com/userfiles/files/kavebo.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/89119e10059dac224e0a7a4a8cc1923d/lineka.pdfIn PDF document text
    • https://corcreation.twbiz.me/data/fckeditor/files/20211022_062139.pdfIn PDF document text
    • http://onestep-tokyo.com/userfiles/file/xunebu.pdfIn PDF document text
    • https://foursservices.com/nbloom/fckuploads/file/jarokamegolowagi.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1616ba02cb8702---31331818952.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16164f8bdee438---fejapu.pdfIn PDF document text
    • https://go2germany.ru/files/file/pomaxegoruviwenisepixaj.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/13243398788.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/bebavegavotuto.pdfIn PDF document text
    • http://xn--4k0b43gkwo4gn.com/upload/editor/file/80487134575.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/161702498157d0---fatarixebametiruwidomod.pdfIn PDF document text
    • https://k85shj16h-561lt.com/contents/files/zapotilosowegesukemeporix.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/nulokuxodevawe.pdfIn PDF document text
    • https://sopkambing.com/contents/files/vimaja.pdfIn PDF document text
    • http://tano-cable.com/d/files/wowejerixomikone.pdfIn PDF document text
    • https://mundolibre.cl/uploads/userfiles/files/51691338825.pdfIn PDF document text
    • http://thebrownbag.vn/upload/files/43252172313.pdfIn PDF document text
    • http://nissan.e-library.tw/uploads/files/20555075868.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/BGAemAmcdTc/uplcv?utm_term=compass+test+writing+study+guidePDF 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_off0000d90f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD90F 16980 bytes
SHA-256: f7a1f9f833716d390c502b51de4c72b44cd916b3f985dd332b4f39c5033037b6
font_01_sfnt_off00010513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10513 16540 bytes
SHA-256: 45015263e28dbf00792e0fa83ae0fb9123af5110209f191c00797c49350166ef
font_02_sfnt_off00011c39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C39 11020 bytes
SHA-256: 1ff940b354cf5bab021bff71c74f9b22c6f46318fb01ad55af2c62b37af1322e