Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e0e9db996edde2e…

MALICIOUS

PDF

81.6 KB Created: 2021-09-06 17:06:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2bc71a885532cd45c546ce3bc031af9c SHA-1: b1b6c95d9c0593c351384b9af1316c0b28e62b2d SHA-256: 7e0e9db996edde2eb1a20d3be4b8e1034100b12bb8fa6e9bf18ae23850723c43
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, with many URLs pointing to compromised WordPress sites and potentially disposable hosting. The 'SE_CALLBACK_LURE' heuristic suggests the document's content is designed to trick users into calling a phone number, a common tactic in tech-support scams and callback phishing. No scripts were extracted, but the overall structure and heuristics point towards a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://hk-dcc.com/wp-content/plugins/super-forms/uploads/php/files/7e0ia4gdhtu17niuqf01vcq9rr/zelanotoxemekame.pdf In PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-21/20210521102856352219.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/92314597495.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/gekofur.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/19787380267.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dbf0e36498---gubidakero.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609bea95b62b7---timakazadowokozaxajesufa.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/13826196832.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/47393238351.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160703567bf270---19920273596.pdfIn PDF document text
    • http://fotocaroli.it/userfiles/files/89075676506.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/firesavajobalegogu.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077e19b0e83e---kobipo.pdfIn PDF document text
    • https://relans-nn.ru/images/docs/file/47428849140.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160acd3616f205---vemigolonivubisi.pdfIn PDF document text
    • http://simonide.org/userfiles/file/25012896843.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/85824007236.pdfIn PDF document text
    • https://xinpayflow.com/ckfinder/userfiles/files/35855198247.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/m4t73ibov9s1t6uua7chv97k3e/lubeveteburomamekelub.pdfIn PDF document text
    • http://aiken7050.com/clients/5/51/510ae66c864a6d23552e02d1b5190e2c/File/67664985385.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad230247981---rudikava.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc16f71349---niguxumevamanagipijigutik.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb6f392764---13664297189.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/8h0v7g5e8s6sv7lpmflhp63qej/felepimibiwuxubakup.pdfIn PDF document text
    • https://sankaibearing.com/userfiles/files/89537421352.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=hpe+proliant+dl360+gen10+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_off0000d7b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC2 18424 bytes
SHA-256: f79f79e451ae48acecdbdcc8f010239635e1612f9a15f55dfe6a2669ed12114c
font_02_sfnt_off00011f1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F1B 11172 bytes
SHA-256: 05120a9b40bffcbd96a4a9453858b7795369a671955b7ae69ddaf86a2ac66f26

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