Malicious PDF — malware analysis report

Static analysis result for SHA-256 c39f755e0b10274f…

MALICIOUS

PDF

79.5 KB Created: 2021-06-18 06:44:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b7400058202fe6e208a105484160db0 SHA-1: 394b15b16d8c784b3a5cec13d66af8c7abdd6aa8 SHA-256: c39f755e0b10274f0064b04e852b9979fe27fdc64cc099fa658afaa8218cad3d
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage, suggesting it's used to host or distribute malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate an attempt to redirect users to potentially harmful sites, likely as part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf1d0395ae---sopakiwodotalugedumo.pdf
    • http://mulroyenvironmental.ie/userfiles/file/39660803599.pdf
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/f8ff63c17a5442a64ac57c3bb580d5b2/42227460367.pdf
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/74ec4040a0088d7c90e43d04dc4c4e27/68461650191.pdf
    • https://mk-sito.it/uploads/file/tatilame.pdf
    • http://castrolmintabolt.hu/images/upload/file/27475538798.pdf
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf509f77cde---vujukuwuxufivinorujez.pdf
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/03155a285ce561f1da9f1f2c539fabe0/19647929265.pdf
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/5khus7cj29c1ntrtr4avcer5j6/rawatozebizufegatiso.pdf
    • http://jun-travel.com/userfiles/file/zasuvavisujapomavisomifel.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1004aadbc---104131100.pdf
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/pajazawufiparogikuvore.pdf
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/85b84cb6011411e78247dcb95f0b6a8f/temibijokumeludi.pdf
    • https://isleo.com/i_photos/file/16978350975.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=simple+vinyasa+flow
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc20.bin
bf6ff9caa6cfc43f8cdc341ca20844c43f5cf59972c21ff6ef405e01b8f1d331		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC20 5308 bytes
font_01_sfnt_off00010e37.bin
252374f664f04ae79ba9aa1199fcbfb4be9dbb772cda939b96073cb611445351		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E37 10432 bytes

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