Malicious PDF — malware analysis report

Static analysis result for SHA-256 61b23428d0ebae2c…

MALICIOUS

PDF

92.6 KB Created: 2021-07-29 21:57:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e86f58abcb599b5e419fa251c6989a12 SHA-1: f8fc485348648554366878139e341a11368e71c4 SHA-256: 61b23428d0ebae2c640d317c74fd612b1098f73061125b8e1cc854904f4a9cd7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to various websites, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://esperanzadeavila.com/fotos/file/98516828651.pdf In PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c79d38e877d---5200827442.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609304576699c---85308546740.pdfIn PDF document text
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160831b0d0b33b---vepojukufojupejefixigamem.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/kexizuf.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/zuwogufofiradaxa.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/vagowavukat.pdfIn PDF document text
    • https://gyandeepjkss.org/userfiles/file/tiwifo.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/xojiregot.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609beed2b9b5c---76044130121.pdfIn PDF document text
    • http://jimigubellifoundation.org/clients/f/f9/f96c94eea877db95ad0a8b6fd709b1ed/File/romerufi.pdfIn PDF document text
    • http://happy-travel089.com/CKEdit/upload/files/32070135159.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/74634461640.pdfIn PDF document text
    • https://inunekocp.jp/mailmagazine/upload/files/75740962106.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609685f29030e---wegufaxudukegovavoxowi.pdfIn PDF document text
    • https://ecole-anglais.com/upload/files/latitajo.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc0cf5ae49d---91256468565.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ac68408d36b---85648711604.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/fbd849fc8ad3bbd78cd3c88ea245bb47/47898758594.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/3526d55f42c239b4591064b806e9d009/loputolazewelepukaki.pdfIn PDF document text
    • http://agarimo.com/archivos/archivos/78760364480.pdfIn PDF document text
    • http://ideviceplus.nl/app/webroot/files/userfiles/files/32096846241.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/fuledapedajexugi.pdfIn PDF document text
    • http://debeleven.net/UserFiles/File/38558435014.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/a62a2d8532036bedffa59c245901e02b/40469602516.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=grand+theft+auto+5+money+cheats+ps4+online+how+to+makePDF 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_off00010383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10383 17380 bytes
SHA-256: cb168d976978bb6cd7f9558bafc519696b985765e5a298859a86913ccc810cdc
font_01_sfnt_off00013100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13100 11528 bytes
SHA-256: 7ad5014899acf05dfbe2d15e877aed77f38e7ab5c23cd1031da6006327753771
font_02_sfnt_off00014c4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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