Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb53eb59df4c0e9f…

MALICIOUS

PDF

90.0 KB Created: 2021-06-18 21:05:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: fa1e879aad7fc4b3155cd1d290ea8ca6 SHA-1: 7afb0eee0fbdffa5ea333fe57ede6eb0d38fd8be SHA-256: fb53eb59df4c0e9f79557b8189a0445d94cb89e3fc8f734b1cbef60f6b2a5498
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms and appear to be part of a link farm designed to distribute malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to trick users into downloading further malware disguised as legitimate files. The presence of embedded URLs and the nature of the heuristics suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://414movement.com/wp-content/plugins/super-forms/uploads/php/files/d46e0b4d003a630ba216b0af0e553cef/21456120502.pdf In PDF document text
    • http://aisef.org/uploads/userfiles/file/file/35915134850.pdfIn PDF document text
    • http://buildinggodskingdom.com/webcms/file/83208194437.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9543ecc8f---37790302745.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609575c1bde65---88205651031.pdfIn PDF document text
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/databib.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/ti5naor6b83db94b6hk0c5c8l0/82888025218.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/g29hnjvn3is729300nsdc55oot/tubur.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/0fd878bc518dc2ac612384210a7b9b0f/xenukuronobononoxefogapo.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/b758370220f0132cab8846ccec8be7f4/mexoma.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/1328e87bc7fc1b9e53eac6f6c7ed180d/30315938895.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/94198395094.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160a82498c482e---joviwivoxeve.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/e49b0c75c296aac23ec4400d57c56728/rijefinujafetekepitison.pdfIn PDF document text
    • https://europartner2.pl/uploads/80040540750.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/e3flgnmhthpcl61qg4t4862hk6/woxivanoguwipenajopatu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=3ds+pokemon+x+downloadPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB49 11700 bytes
SHA-256: acfa6e9ff8e814cc363e318d90edb921a953baaad0cc2c8b7f6ed017781e7190
font_01_sfnt_off00011206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11206 5300 bytes
SHA-256: 05255facd1b06321f27c55a5dffbcc861589e7c9c2e22581df39cdf734f01c7f
font_02_sfnt_off0001240f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1240F 17900 bytes
SHA-256: 6880e2e8e2126c9b8467ca56cbbf801fd747d5fe9a5de81b13b15a17628dd401

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