Malicious PDF — malware analysis report

Static analysis result for SHA-256 65a2dc913a1ada6d…

MALICIOUS

PDF

87.1 KB Created: 2021-07-30 12:14:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 43cf1afc293bb7d22fb971f1f46ca978 SHA-1: 96ba11c9c0ce8829c7c537f3435a0bc3426c5863 SHA-256: 65a2dc913a1ada6dd965ad0c9d0960ea60015e0f0bde73c36d6fd7336dd2c30c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm and a callback lure, prompting users to call a number for a fake issue. While no scripts were directly extracted, the presence of numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggests a phishing or scam campaign designed to redirect users or collect information.

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://cructi.ru/uplcv?utm_term=how+to+do+an+ei+report PDF link annotation
    • http://global-insurance-broker.de/downloads/53423352495.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/30810907808.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/pifive.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/50798060497.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/romv2spt4mkdjak57ft12ih271/safijaxivi.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16081d59947055---62048404071.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/386afe8837dd1cbf71c4e8944ad5c643/57321655755.pdfIn PDF document text
    • https://hmanagement.net/userfiles/file/64317636512.pdfIn PDF document text
    • https://festacontinua.it/public/file/bipurexokosidoza.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160758193617fa---xiwesidunurovi.pdfIn PDF document text
    • http://sochi-riba.ru/ckfinder/userfiles/files/46198591092.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/okq9lkjj24ga800paatoqe89vd/feditawonoli.pdfIn PDF document text
    • http://elitvorota.ru/f/file/55088464903.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/5ckub5l9e7999nkgf11s4ofhpb/60101886876.pdfIn PDF document text
    • http://ylplj.com/ckfinder/userfiles/files/gowokusod.pdfIn PDF document text
    • http://designbeginnings.com/upload/file/64959298432.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/172804559998a2afe6029a750a1e9423/nolozajutavo.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc8567de2a---nuxepomezilup.pdfIn PDF document text
    • http://simmsfamilyreunion.com/clients/9/98/98d47f1658d09d39d77ba56043454c9c/File/vomevudorosadif.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/75473307608ac0ae8d9bd.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080c9fa72b03---29390388624.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abb53d7c753---febilo.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ffe332b5e---masetuzojofukuperim.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/42694507392.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a204f34a752---40265576063.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7645e6ede---gokuxosiveg.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_off0000f42a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42A 16732 bytes
SHA-256: 24c370d590bc2e9d1e7a91d46760cb6c2c0095f2e88574e907e46634dd58c862
font_01_sfnt_off00011f70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13787 10248 bytes
SHA-256: f138972af387c4b587f8e93782d8f9f8c6c0bc518679d12ae36cda46cb2ad547

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