Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9e4381ff5e461fe…

MALICIOUS

PDF

71.1 KB Created: 2021-05-07 09:35:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 06dad10c257ba9653d8ca9fe55d9e1e6 SHA-1: 2ec805cb94a91393b3ad1464de51976ee13c18ee SHA-256: c9e4381ff5e461fe33eb83258974eb433890668adc6740fcab6f446ca77244c7
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to compromised WordPress sites, suggesting a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the presence of external URIs and compromised CMS upload links points to a phishing or malware delivery attempt, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://crysiq.ru/uplcv?utm_term=autoimmune+disease+definition+pdf
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/8eb38c765571e06b8787118662dbdfc0/zenobodelujomemovawubujaz.pdf
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/b9872069c3228bac1a4394e30006b9e9/78062098500.pdf
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/rr4fb5s613j0dv97qrsoclt9s3/73574231772.pdf
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/16081e46d9858c---67785751500.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2708602c7---74910656289.pdf
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/rq9po5sd6k7ql6uub21tbrp3f5/nadobevodamiradif.pdf
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee0e602cd0---gufabidunuwu.pdf
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/2d00m8jn327qldemqr5ajvci6l/74870506622.pdf
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/6539a6e5585e34e9f555b804294525ca/didudakifuga.pdf
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/23e5564377379add524eeafc9bc2f865/soboruxugede.pdf
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16089084580ef4---87755867414.pdf
    • https://acgroupenterprise.com/userfiles/file/kizozonumajutos.pdf
    • https://amatnieks.com/pictures/image/60747197138.pdf
    • http://aldo-ins.com/userfiles/file/legabisexiboxunu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d85e.bin
15533f606f7cfb3acfb31a559d47345eefb14978a05caa5d3cae8b1bca1d22a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD85E 5048 bytes
font_01_sfnt_off0000e983.bin
50b2cc39ed6f320b05d57418b6e6d6809241deb3208b2c743a8e65cf51d8de0d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE983 12108 bytes

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