Malicious PDF — malware analysis report

Static analysis result for SHA-256 b50fb468845c5c65…

MALICIOUS

PDF

78.9 KB Created: 2021-06-29 19:19:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3157c1547140848643b7360ecabe28ce SHA-1: 644a8781ea88f83413b7f8408e0fbbee5a11aa86 SHA-256: b50fb468845c5c6575c4e784b672f1968ac910c52e64a2784394eeabd77d71da
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to various compromised websites and disposable hosting, likely intended to redirect users to malicious content. The document's structure and heuristics suggest it is part of a phishing campaign, potentially using an invoice or payment lure to entice users to click on the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://laborke.ru/uplcv?utm_term=think+utilities+services
    • http://susasoft.com/upload/userfiles/files/gilujogiku.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a0b043764---kurubav.pdf
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/25h8k6p9brcsbjhjqf4rk53o7m/32292182570.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1653ec9cf---jixuvezamejisu.pdf
    • http://karat-dobremiasto.pl/userfiles/file/toxup.pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608255aad57a7---gemejumuroropa.pdf
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f3f554e91---40795931525.pdf
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5df29b40c---zezubopinubanibonawik.pdf
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/48e85d960d7b0cef66dc9ccbcfea5929/zamuxusefizediziz.pdf
    • https://agrilaui.com/userfiles/file/89359908441.pdf
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/891f7cbef1edbc43f0eeeb8de54f597e/jureletarijem.pdf
    • http://futurepoolandspa.com/ckfinder/userfiles/files/94976542946.pdf
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/0f0si63boo6t2dmq67ojbd808m/53136898525.pdf
    • http://activesolutionelectric.com/images/file/67496001774.pdf
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/ero1vhc3fo67jmm5o4f83m13m4/malejeze.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a27616a771---78663011810.pdf
    • http://hyundai-dongdo.vn/images/files/mipulokulisasoratilejasol.pdf
    • http://simonide.org/userfiles/file/gimoligusojesiwudil.pdf
    • https://sofanet.ro/ckfinder/userfiles/files/lugigimupoxa.pdf
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/suv0gg36f4lipau6vv3krgs27b/kevidade.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d047c30c7d---vawisudipuperesiz.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9cdb8ca13e---7700346303.pdf
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc48.bin
b14fe7d6395cda7a026309faf8bac6da2be1a70766c90c54b4d7529dbbfda092		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC48 10264 bytes
font_01_sfnt_off0000e352.bin
a6a521d10e9cbe35ed7d778cd7f4d3fb98e726d97e16e522db373b14f07deadc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE352 19216 bytes
font_02_sfnt_off00011517.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11517 16792 bytes

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