Malicious PDF — malware analysis report

Static analysis result for SHA-256 b77eaed70c7dcdf5…

MALICIOUS

PDF

78.3 KB Created: 2021-09-19 10:38:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 85f26cbe741a81cccc30eba95fac2a5c SHA-1: 95034bf3afc6a5942b7d035fd75d8a34595d5323 SHA-256: b77eaed70c7dcdf59d35cdeaf24b556199fe8a8284fa371a17116f656a3bf547
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to external sites. Several of these URLs are hosted on compromised CMS platforms, suggesting an attempt to distribute further malicious content or phishing pages. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://hogozaty.com/ckfinder/userfiles/files/jifogomo.pdf In PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/96768085899.pdfIn PDF document text
    • https://theshamrockpublecco.it/file/73370823424.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/15947266807.pdfIn PDF document text
    • https://rawoctane.com/uploads/file/51636991109.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131aebe0de24---tirodisosiwuguwatuxud.pdfIn PDF document text
    • https://southernwashpros.com/nbloom/fckuploads/file/vetibudak.pdfIn PDF document text
    • http://laarakkers.com/ckfinder/userfiles/files/44454714291.pdfIn PDF document text
    • https://www.domaine-vrignaud.com/ckfinder/userfiles/files/74370073421.pdfIn PDF document text
    • https://callmarkinvestments.fortunekenya.com/callmark/files/12122347194.pdfIn PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/29348812017.pdfIn PDF document text
    • http://syntrend.critical.tw/upload/files/waritakit.pdfIn PDF document text
    • http://pm-ural.com/uploads/files/38374888170.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/12247689778.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16146bdb7bde14---vezuvapubena.pdfIn PDF document text
    • https://tootooair.com/FileData/ckfinder/files/20210914_6DD753DCCAC54DE3.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/koliwosevedewewepokov.pdfIn PDF document text
    • http://www.jasfec.com/imgs/uploads/kigikeguwafexuxinus.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16140298fac9c1---todajalubidutodisubox.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/j20u88f6ms948965hvt3llv365/76026542396.pdfIn PDF document text
    • http://zhihepvb.com/upload/ckimg/files/202109092045136386.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/41038660836.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/sizoxavofuwulorovoxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=seyi+vibes+all+songsPDF 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_off0000cc33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC33 18340 bytes
SHA-256: 9c51d32117c5d3e31adb4a314b65d2b94cd325c803715c60426c6ff3d7f6bbcb
font_01_sfnt_off0000fbfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11412 10480 bytes
SHA-256: 6b50ee0b58b9e24750b0afb332fbfc94f5ce7097a66ca470ce75d2bf4302949f

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