Malicious PDF — malware analysis report

Static analysis result for SHA-256 74a27080d85e0b49…

MALICIOUS

PDF

84.2 KB Created: 2021-09-03 13:49:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 16531aeba76da80c3644502a2c96d1f5 SHA-1: b2bf562d2d59b752874ebba4023e016c3f7ebf1f SHA-256: 74a27080d85e0b4900a3a5e0eea8e576cd53acf157d5281c3428ec305bf4b62f
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or malware distribution lure. It contains numerous links pointing to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm designed to redirect users. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://naviway.su/upload/files/fibufasimipexumineku.pdf In PDF document text
    • https://villamishkan.com/310renonew/front/images/files/paxete.pdfIn PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/46641279371.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/31f9053740a635790d3374572d25bcdc/titadog.pdfIn PDF document text
    • http://duonglaohanoi.com/userfiles/file/24035994684.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/7a6857b1216ffbdbcd13001d9de66185/guvajepimanebo.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/lofezawu.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/ledowutagem.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a0caabd1df5---40138820559.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160806a7e68245---mudigavokoguloxugeda.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/xafazobudex.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608473d2c0ef9---73950908269.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161002482c45e5---23473178149.pdfIn PDF document text
    • http://denge.aero/upload/files/bapagabar.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/j605mtbqbreu0ckpr6a8htnp9u/41894331025.pdfIn PDF document text
    • https://tatvan.in/userfiles/file/38846324589.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16086f9117d14b---bugowufizeg.pdfIn PDF document text
    • https://journeywithmypet.com/ckfinder/userfiles/files/56875576300.pdfIn PDF document text
    • https://sbsoftware.ro/admin/userfiles/file/68613533653.pdfIn PDF document text
    • https://terlickodds.cz/www/www/fckphotos/file/29667080542.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/0va4822lm69mtdm61athr0am3k/67407079409.pdfIn PDF document text
    • http://ithalattagarantibelgesi.com/resimlerfiles/wadufafopazetezokag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=grandstream+gxp1625+manual+configurationPDF 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_off0000e0e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E2 11680 bytes
SHA-256: a25d2c97b6604a6a6cb994815da641c069d6344340a18973bee122badd8955f5
font_01_sfnt_off0000fca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000114b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114B3 17820 bytes
SHA-256: bf22ed93675a5d538c6d796e04e9a573527af1cf18873a2523a477a6688a0346

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