Malicious PDF — malware analysis report

Static analysis result for SHA-256 90713a839a8c40f7…

MALICIOUS

PDF

83.3 KB Created: 2021-08-29 12:53:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a3d48408c466e449214af44ef152b385 SHA-1: 144b603c399ef1137088c3f1923b1a8729746d39 SHA-256: 90713a839a8c40f7c5feb5cb648e29d80e5213b17c977ee88b68e0cf4a844ccf
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or trojan delivery mechanism. It contains numerous links to external domains, many of which appear to be part of link farms or hosted on compromised CMS platforms, suggesting an attempt to obscure the ultimate destination or leverage trusted domains. The presence of embedded URLs and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://allytemp.ru/uplcv?utm_term=sleight+of+mouth+nlp PDF link annotation
    • http://banghetretunhien.com/media/ftp/file/71402171807.pdfIn PDF document text
    • http://boissee.fr/userfiles/file/71227971675.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/ag94f44vb9qjdjncg8kttqmlgq/57874137171.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba25dc4f53---zovazuxomotalurasik.pdfIn PDF document text
    • https://facades-metal.ch/ckfinder/userfiles/files/lulojiju.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/2607430c5fb20da57c61d368712699c1/nimapilafulegebodowanib.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/4c33d2b0425160dd730adc8f6af579a1/54758996483.pdfIn PDF document text
    • https://hr-serdahel.hu/images/file/6963429450.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/336bd256dc524597217f5c88bd5d20a6/mifaxetenawiwadogi.pdfIn PDF document text
    • http://hsiwww.com/image/files/20210724_055944.pdfIn PDF document text
    • https://tomclarkvoiceovers.com/userfiles/files/dawuguxijubunufulobo.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/ad7cadbb4a24b96e16dc3556120545b1/65674013629.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/49e8b1ffbbc87c39f5513465db967127/26301752672.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/on25iev5foft6l2l4pboloe6q3/14502187426.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/10e99b9fe73a8837d249dcd92db2e209/gezoxotidivenewaf.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5ca57cf02---vawamorutafim.pdfIn PDF document text
    • http://torgoborud.org/images/file/mabosugut.pdfIn PDF document text
    • http://digivideos.net/ckfinder/userfiles/files/wofuxawevariwididexagejow.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/b66d49d727e18ce2db4a914d496d70a4/57485585373.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160aeae30512ad---dofitowewelabuji.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089bf08477c5---wovokaxigozujapupivajadep.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611105be4465b---61838402778.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/5e298dc80db9220457e612aa12306dfd/sizuwowakifu.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/99a9c081213b255467251df06900f968/pedetikenunibudogovup.pdfIn PDF document text
    • http://namkhoabacninh.com/images/files/26598499521.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_off0000df56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF56 18328 bytes
SHA-256: 8fa1accca42db713b44d9b49c4d8d9594fd095054e786e157a6ab6b3df28e343
font_01_sfnt_off00010e84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001269b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1269B 10548 bytes
SHA-256: ea67e61ca5449e4df7aa224e638fd79376f511f7b162b0ce971ae6afddb85f0a

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