Malicious PDF — malware analysis report

Static analysis result for SHA-256 42cd22e7be499656…

MALICIOUS

PDF

90.5 KB Created: 2021-09-18 11:52:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 326ae1e96079c85e5b194bb953403b02 SHA-1: 49e17dade03783a7605a3c60582a0cf8a9e74f7c SHA-256: 42cd22e7be499656ca9fd5641fa257bed814f9e07211838f872524fe3c163026
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to PDF files hosted on various domains, many of which are likely compromised or disposable. The presence of 'utm_term' parameters suggests an attempt to track user engagement, common in phishing or spam campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614390e89defd---lasajeronukuzadezujobe.pdf In PDF document text
    • http://altronic.pl/!mag2011/userfiles/file/moxowupuludidigurapozegiz.pdfIn PDF document text
    • https://alaqart.atelierleuthold.ch/userfiles/files/1154671130.pdfIn PDF document text
    • http://taiwanquinoafamily.com/shopadmin/upload/files/dovogaxomukuseminu.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/8e29ddb4b02c8360c478ce1accdb5377/gobozulu.pdfIn PDF document text
    • http://xingyeknitting.com/userfiles/files/gakadusetawaxav.pdfIn PDF document text
    • http://linkipt.com/_UploadEditor/files/11982133580.pdfIn PDF document text
    • http://ninda.vn/userfiles/files/82774989931.pdfIn PDF document text
    • https://hotnews.md/upload/userfiles/files/xifemadutomiwefo.pdfIn PDF document text
    • http://dpsnowodworze.pl/userfiles/file/4144566546.pdfIn PDF document text
    • http://fsnmmaterials.com/UPFILE/userfiles/files/wuxavawofujalijubafok.pdfIn PDF document text
    • http://neodentpetrosino.it/userfiles/files/25261908770.pdfIn PDF document text
    • https://www.hkfew.org.hk/ckfinder/userfiles/files/minazutupoti.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/161300c23a43c1---fepusejeba.pdfIn PDF document text
    • http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/6338477960.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613305626028b---74970697529.pdfIn PDF document text
    • http://labonscafe.com/userfiles/3451174011.pdfIn PDF document text
    • https://abrasco.org.br/ckfinder/userfiles/files/sovutipi.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/23870775515.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/raxujofadarupesedelopixiw.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/qs3se9gonlb7v4jubuh75l7lud/jawope.pdfIn PDF document text
    • http://hoigolfbinhthuan.com/users/files/82271881450.pdfIn PDF document text
    • http://efuturesthai.com/uploads/files/jasizivifakuputatafodoz.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161413c42ef8ea---8919332707.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/nupapilokavesa.pdfIn PDF document text
    • http://qdcmd.com/data/files/gopujaratumekakozoku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=gta+lcs+android+100+save+gamePDF 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_off0000fd1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11531 17448 bytes
SHA-256: 7cb05b7d99f7bf0e2aa3ceb16c43283d57518b515594e45ebeeeca1b565eaf5f
font_02_sfnt_off00014261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14261 10992 bytes
SHA-256: 90c976cc97d04a027cdc487e38e9f64dcef451141cc3af348c1f18e22c458873