Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf4f38bb5757f713…

MALICIOUS

PDF

72.6 KB Created: 2021-04-29 21:13:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5ae5ab9bbaac9e4b663a57aa2b97ce7a SHA-1: b9256fcc27bb4f2cb1d3c1d412addcfb425f7661 SHA-256: bf4f38bb5757f7130117c63bc0f5d85183927ebd189fd5aea32c744a765774f8
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous links pointing to compromised WordPress sites, suggesting a link farm used for phishing or malware distribution. The presence of embedded URLs and the nature of the heuristic firings indicate an attempt to redirect users to malicious content, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b37c8ac7e6---80411182760.pdf
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//46042139215.pdf
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160762fd89d2bb---vuxitesulipalufopase.pdf
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/b22276a39d559e425727b18ed7ac776b/nekufalidejevuwaf.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/fsq83jf45nou3jpqqv4k0ladt1/nujefazajufu.pdf
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d852c4b0f---foranumelukeviwu.pdf
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/3c63c9d0324ed317fbf4bbaf3297fedc/19939862418.pdf
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082bcb70d5bd---62893168098.pdf
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16081d95fa0cb9---gixixipimibulewenobaruzu.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607913dc9f94c---karorok.pdf
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/5d1ff6fe209269dc8a109b59b5ba262d/56026765236.pdf
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160862183eb784---28734282909.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=formation+auxiliaire+de+vie+tunisie
    • 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_off0000dca6.bin
9d16cc158633b16ec08968c083a09ad58700d58fb91eec5a5e4946d88e7682d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA6 5056 bytes
font_01_sfnt_off0000edc0.bin
a891c11ef7adb3c9bae5e6c0a8d0970a5707df3246095f75096b78ec82753ef1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC0 11964 bytes

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