Malicious PDF — malware analysis report

Static analysis result for SHA-256 af7425ac0df66ad7…

MALICIOUS

PDF

75.5 KB Created: 2021-05-20 15:59:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ecc8eb957f95564fe6929c3fa9f3b293 SHA-1: 1f8c37f67864f5408bf55f1ee604c6b802210c89 SHA-256: af7425ac0df66ad7005ddf4e37fe526ef83247e98dc1d3fdfd48b2930c8ddb8c
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous distinct hosts, many of which are compromised CMS uploads or disposable hosting. The embedded URLs suggest an attempt to redirect users to potentially malicious content, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/gt3j7a2pdocvt2ajku7k5qa6pa/xukewibepolutefap.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/464cce11fce6dd20090b5bb310c14c01/zamibesozilirax.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a54f456c03c---17199583196.pdf
    • http://notarbrazda.cz/userfiles/file/7944230266.pdf
    • https://samarpanbharat.org/trila/userfiles/file/94188208886.pdf
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/b839035d8da073793949d1ce7ace95b6/36362812564.pdf
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1607712bd74812---1563436814.pdf
    • http://accessiblevehicleservices.com/userfiles/file/zikezudamozaleku.pdf
    • http://bettynblue.com/upload/fck_img/20210512/file/93119475551.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077a1374b8da---53773997311.pdf
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca13f8779a---dikebubajamulepoxaxupeva.pdf
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160741bae62f53---82593587590.pdf
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160759339ed8bd---zugodukadonuludijuni.pdf
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/30a65905b361ec95d62ef98ac4dfe401/53039281813.pdf
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc11fe4617---timasuzu.pdf
    • http://albino-pitti.com/pub_img/file/gotat.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=snake+bite+antivenom+for+dogs
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eaca.bin
90e71edb8c7336db8e1415959b228eed5408fb44cb34c6d16dce81fd30f23038		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEACA 5564 bytes
font_01_sfnt_off0000fdaa.bin
d2fbf031d4046249251307a07c2dc052eb901091bb541ce1807459d45b221251		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDAA 10476 bytes

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