Malicious PDF — malware analysis report

Static analysis result for SHA-256 f32caeeec668d89d…

MALICIOUS

PDF

96.4 KB Created: 2021-06-25 23:35:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 6791c548a4eba8b71aafef42ae746104 SHA-1: cfe859c21f9d53b779e5e23736f6218e8d931bfe SHA-256: f32caeeec668d89df21f81f220c0aa8152da72e9b0d35ac147650aa7e603b84b
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://heninrealty.com/userfiles/files/63520578462.pdf In PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16071a714499f9---febusagegovojofowabo.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/tovuwolufeduwepudadu.pdfIn PDF document text
    • http://fontanarosaserigrafia.it/userfiles/file/folitipuvimebejowutisagaz.pdfIn PDF document text
    • https://serini-cloud.pl/uploads/editor/file/kusoxisisino.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160886075b67f0---zopaf.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/0b1d56fe69aaf9c18bdb5cd5335e6a84/73559228367.pdfIn PDF document text
    • http://skybuildinfraprojects.com/uploads/xugemalabutomerigoren.pdfIn PDF document text
    • http://herculesestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vubifesemivuxoxakan.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/70002256666.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c109930f6d9---posogikifoxigiko.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/nenabo.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/95041489307.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c733937b5c8---kujogidirim.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607fad5804008---gaxetegexawatib.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/1cb7b352284757f3ed128959cc6e1ed8/38044274914.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16095aef5a9238---namazevudip.pdfIn PDF document text
    • http://canvangdientu.com/images/file/52217086280.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608802757e6db---nusenozug.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/vaxisawe.pdfIn PDF document text
    • http://picassogift.com/Uploadfiles/files/49459132847.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=artificial+intelligence+in+the+4irPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11034 16924 bytes
SHA-256: 2fc8fab4695de3debc30e0fccfb4f6dd7de42fddacdcad9afe1613f76e836074
font_01_sfnt_off00013c36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15443 1736 bytes
SHA-256: a970dc50f3fc642965faeb3d6f2817be39c8fee70eb220fb851f6e1b0fd382ad
font_03_sfnt_off00015c88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C88 10384 bytes
SHA-256: e69d24a349a9f0c0ffbe1180f9752efeaf60820b5e327564dc7a722beaee9c6b

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