Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4ffe7aa4afb02a3…

MALICIOUS

PDF

93.8 KB Created: 2021-08-04 04:30:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6a3515df0dc63177e7e52ebc563fdaca SHA-1: f353d7d3af315fced32ba5a85640edeafb4d3edb SHA-256: a4ffe7aa4afb02a3667be9c2934de57db1c7ca9f29bd7d9ee4ff52b34dd006be
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to potentially compromised or disposable hosting, suggesting a link farm designed to obscure the true destination. The 'SE_CALLBACK_LURE' heuristic indicates the document's content is designed to trick users into calling a phone number, a common tactic in phishing and tech-support scams. While no scripts were directly extracted, the ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 7

  • 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.
  • 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.
  • 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://3xlove.com/uploadfile/file/gadezosu.pdf In PDF document text
    • http://nipissing-lodge.com/clients/b/be/be32fa5c9d1e5a871f1efa0d35b29fe7/File/55078741841.pdfIn PDF document text
    • http://tysons-cafe.com/uploads/files/6349140912.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/53358512128.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160730bbfe61e3---99080177533.pdfIn PDF document text
    • http://naoshima-habitant.com/19475077018.pdfIn PDF document text
    • http://bangdientunhk.com/upload/files/jekumakefek.pdfIn PDF document text
    • http://thefjordbaklawfirm.com/clients/876731/File/6024297971.pdfIn PDF document text
    • http://pietroquatriniarchitetto.eu/userfiles/files/tadaziwegobeset.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/63498ad5c4f71a555287888f18906f4b/kutebemizur.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5fa30f65e---92683815839.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/313f4f80a8f6eb864d45e5e98230c659/bumifeberorigibefinidib.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/39b169a1cf52453f8111f240caaab735/vegosizifel.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/b45c5912b6419669c83943f653a5fcc8/51215441563.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/db0a37ad1d8e320c0d922051886b63d4/rusopoxesone.pdfIn PDF document text
    • http://americasbestmanassas.com/uploads/files/53401915553.pdfIn PDF document text
    • http://hkalc.com/userfiles/sogumoginenamabipejewosu.pdfIn PDF document text
    • http://www.macrolepidoptera.hu/userfiles/files/82764013921.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/qi3m44dp3id0f87dn8dolfpiv2/87906823179.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/jiwux.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608647f26abdb---97005997033.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=gotranscript+test+answers+pdf+september+2020PDF 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_off000103d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D0 19748 bytes
SHA-256: 382d77b85ae1deb0908f73024178c0a3783d0cf2c41c886ff97046bfdf55857e
font_01_sfnt_off00013659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13659 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014e70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E70 11244 bytes
SHA-256: 63f23b3b596da5b9d66fe1aa772c24c1173bcd19b14c67ca7bc5889c283c8973

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