Malicious PDF — malware analysis report

Static analysis result for SHA-256 1651cb7307900087…

MALICIOUS

PDF

72.4 KB Created: 2021-09-02 14:12:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a5f5c1269be4d2c396a0456788cb6cc0 SHA-1: 305dc448fc81cc4e1f28dbe07e381d36af4eb1b2 SHA-256: 1651cb7307900087e42e872a82cfc1ea9a7c3ada5417aaee8a7563fbd7fa88d5
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was identified as malicious by a machine learning classifier and ClamAV, flagging it as a phishing-related trojan. The document contains numerous embedded URLs, many pointing to compromised CMS upload storage, and exhibits characteristics of a callback phishing lure by prompting the user to call a phone number for a fabricated issue. While no scripts were explicitly extracted, the presence of embedded URLs and the phishing lure strongly suggest an attempt to deceive the user into further interaction, likely leading to credential theft or financial fraud.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://www.ettermanenterprises.com/ckfinder/userfiles/files/96239604444.pdf In PDF document text
    • https://deycaterers.com/ckfinder/userfiles/files/refuwanelilika.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073bf38d3129---60611005853.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e182b1a0bb---komegegewanetovizaz.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/11820816094.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/vudejujurukagexafevisoji.pdfIn PDF document text
    • http://hifimarkt.eu/kunden/kronhardt/ckfinder/userfiles/files/98297843623.pdfIn PDF document text
    • http://tostonet.cl/ckfinder/userfiles/files/fipini.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/2e45d1facf2b33aa7933a9544e591723/xefifana.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd7922243a---45510602931.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/66306476306.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/renulomub.pdfIn PDF document text
    • http://icmasistemas.com/userfiles/files/volurivujejiwalosiges.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/535c800662488d73c5aa0ca0dce0271b/nominovugukomata.pdfIn PDF document text
    • http://gokea.org/upload/editor/files/10993436795.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/f0cb0978697eb15403d475cfe1fe0b70/55173502789.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/0d7b4678066a78083c839eed7f0b2689/xiwarejikesiluna.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8dce911cf5---49682573575.pdfIn PDF document text
    • http://unewstoday.com/task/userimages/file/fevufizawonuwilovekimaxuz.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4177991ec---74578529603.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611eb05b954a3---88148277949.pdfIn PDF document text
    • http://yngc.ru/admin/ckfinder/userfiles/files/29476346000.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/57907895653.pdfIn PDF document text
    • http://vincitydata.com/uploads/ckfinder/files/tupajitobegap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=everlast+powercore+freestanding+heavy+bag+manualPDF 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_off0000b898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB898 15096 bytes
SHA-256: a59130de9431e3a5dec4226e29ad8261ea539a81977c5fcb42d86d5b7306ac4f
font_01_sfnt_off0000df2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF2F 11556 bytes
SHA-256: 1c40e6518b0ca8b1ad85b8286bbf3e1f78b2c8976f4904710363cfb64713ee0f
font_02_sfnt_off0000fa0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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