Malicious PDF — malware analysis report

Static analysis result for SHA-256 529c8164a9d6cc7b…

MALICIOUS

PDF

90.0 KB Created: 2021-09-02 15:46:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3bc2fb9e025cfbb6b484ce1f3e985047 SHA-1: a43707e70fdc0cbb3360d887f794aa16f9ff1cbf SHA-256: 529c8164a9d6cc7b6865025299afc05b53a6e11814b389c2d9c44152f5f0cf35
192 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains embedded JavaScript and numerous URLs, some pointing to compromised WordPress sites, suggesting it acts as a lure for phishing or malware distribution. The presence of invoice/payment language and callback lures further supports a phishing or scam-related attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 9

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://chcial.ru/uplcv?utm_term=all+accounting+ratios+formulas+pdf PDF link annotation
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070817431fab---61440934621.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/6346698387.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ddafc272ab---99186480945.pdfIn PDF document text
    • https://pixel.bg/img/file/48094104551.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/24744264512.pdfIn PDF document text
    • http://influences-vegetales.eu/assets/Image//files/42915998448.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/movozubosebi.pdfIn PDF document text
    • http://df-2.de/images/daten/file/72685914483.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/kuwoluvafus.pdfIn PDF document text
    • https://tekdalyapi.com/upload/ckfinder/files/wenuzipijetumubenid.pdfIn PDF document text
    • https://www.travelknowhowscotland.co.uk/assets/js/ckfinder/userfiles/files/kipewulodaw.pdfIn PDF document text
    • https://hgb.se/filer/file/86018167813.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/zuvumimakusutapexobijalar.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160dd8373f3f0f---83607378964.pdfIn PDF document text
    • http://vce34.ru/attachments/file/madadu.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160b918f893148---numadox.pdfIn PDF document text
    • http://essentielles-theater.de/UserFiles/File/tafibinoguxebe.pdfIn PDF document text
    • http://thenext.pk/userfiles/files/fiziw.pdfIn PDF document text
    • https://interference.ajoda.eu/userfiles/files/mikipejorikawagasakazof.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/b226ce1bd286a7350335b5911d463c94/30800176723.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9fd08d424---nabuserugilagixudar.pdfIn PDF document text
    • https://www.nuyew.academy/wp-content/plugins/super-forms/uploads/php/files/d6e9847ec69a9830f2681cf302124b25/62692078632.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/c22ac365fb5a561764028a7ac171ebdd/98037923376.pdfIn PDF document text
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000110de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110DE 18608 bytes
SHA-256: fa17d0aa4d3e0753cd615fe7d67785be5a9c457b1c6e0bbf8fd8b2caef809c23
font_02_sfnt_off00014113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14113 10912 bytes
SHA-256: adee9d70f3f1b15a87584d5b04e9661f4eff1cd7800b90e26e22f90c4da9e327

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