Malicious PDF — malware analysis report

Static analysis result for SHA-256 640746f337edf34c…

MALICIOUS

PDF

83.2 KB Created: 2021-08-15 05:53:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e9924d9f54c28c6ba83a5fefc2ebb67e SHA-1: 1388e207d844a69185cbd6a0ece7b85be858de8d SHA-256: 640746f337edf34c11a6e7b7edfa528449fd9896aa733371332c499656172163
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains numerous links to external websites, many of which appear to be compromised WordPress uploads. The SE_CALLBACK_LURE heuristic indicates the document is designed to trick users into calling a phone number, a common tactic for phishing or tech support scams. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to facilitate further phishing or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • 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://inwebjor.ru/uplcv?utm_term=a+history+of+american+higher+education+thelin PDF link annotation
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/teborejerimored.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/c0132860b95b699d3e7d10ad7c9ecb4f/sopumapibupuragigawetik.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/fdb451646aa1e95fb9fcb629c769981d/40006734230.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/89b5a3a12fcba217b9deed104778b098/10925539481.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/c24624e0af446207974a9afc3f16ae27/63370365648.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf98291b718---93060152372.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/53475184502.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160725ac61d550---sosarawagekukogosifid.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/mjfjmob8h57d4hr29r0tstlvur/82756460338.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/j40q6p0h9e8d0ljq7fvn2cn8st/vigesipolefewibunu.pdfIn PDF document text
    • https://giustofiori.it/file/rosuliz.pdfIn PDF document text
    • http://whs1979.net/clients/65916/File/49589526258.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e57ed3717c---kulaganuwubotufutigigup.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160afa2481c805---5123210848.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/ee71pvgac05lkhqlu3u636bt5q/32022099690.pdfIn PDF document text
    • http://odesignlab.ru/admin/ckfinder/userfiles/files/20342077545.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/mdhkb8gq10gve812mkvqaajk8q/vetobumuxukadiwesesux.pdfIn PDF document text
    • http://mudrberanova.cz/userfiles/file/jovofofiduko.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/23793942716.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/ed59d075c0e47c4ec24937a08c1f25ec/loduwejesakagimisufuto.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a04a8466e14---39520951607.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a952e0de02b---27644336463.pdfIn PDF document text
    • http://klinikoral.com/img/userfiles/files/97951718397.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/wuxulutojugup.pdfIn PDF document text
    • https://mgogs.com/mgfiles/file/suvezito.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160b4b6fc85140---bujifavepabagaj.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E9 11120 bytes
SHA-256: 8ae1ba7fca7bbc0526f88a3d94a13cafa3973f0ca282d4ffb0da2d84cc175d64
font_01_sfnt_off0000fb90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB90 16640 bytes
SHA-256: 62721e964c02297ffc316fe68c2824ee07ed41c5d0e5f605f7984d5975615cd3
font_02_sfnt_off000126bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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