Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5c45fa84dcd074a…

MALICIOUS

PDF

92.4 KB Created: 2021-07-24 20:09:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 50366424b80fe4472f41799722c729df SHA-1: 931b27de3f806788c0b10bb5f3779fdbbe4fe627 SHA-256: a5c45fa84dcd074ac28e920c5dc6a357043c4591589e22f6daf0f4d9985b4951
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to potentially compromised WordPress upload directories, suggesting it is part of a link farm designed to host malicious files. The 'SE_CALLBACK_LURE' heuristic indicates the document's content is designed to trick users into calling a phone number, consistent with phishing or tech-support scams. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence score point towards malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9866

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://hyosangjo.com/userfiles/file/20210626140336.pdf
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/9c3557843c6bf8a8eb79de4e793c4dd1/58929952594.pdf
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eaee2e6573---22575582057.pdf
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/0dd112d0645fd70d2e42c395fbd22ecd/74664446574.pdf
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c17199adc---13721263064.pdf
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/45648115572.pdf
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160d208ebc578e---wakokadevaxovov.pdf
    • http://fruitofthespiritcatering.com/clients/9/9e/9e5e3efd27976f294ade36eaf76108d7/File/pelovevodemegabutugaxekuf.pdf
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606ed9e23f803---jetenopobu.pdf
    • http://sunnysolutions.it/uploads/assets/file/zidigaselaw.pdf
    • http://trustycctv.com/ckfinder/userfiles/files/1527789139.pdf
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/f1f5283d29ad7bdebe8a8edf9f0573c4/jebokafinosasadabelirife.pdf
    • https://abofahed.com/userfiles/file/fitil.pdf
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4ef3cd3772---9774160798.pdf
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad97b94b12---87992020660.pdf
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16087f43d0d415---tudoni.pdf
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160c9d3790d6fe---60538946910.pdf
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092c515a0ea0---fefiguguzewezanomob.pdf
    • http://hesexpo.com/img/editor/image/file/zanatosilul.pdf
    • https://zlato-eu.cz/upload/files/mofimuliviguzu.pdf
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/17e6c08f0f1df2f17fdaffda78e13d69/52592478090.pdf
    • http://1utilaje.ro/mm/file/73162635293.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16071e72386350---xetavuperirum.pdf
    • http://dagmar-e.de/userfiles/file/27938629545.pdf
    • http://riskhedgetech.com/uploaded/file/99340374160e857c191a27.pdf
    • https://lapalettedesarts.fr/gestion/file/tikoliwateronipoza.pdf
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/f7b62c21ff58877e1d2b957045717bf7/64166347346.pdf
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160706d856b837---77901237201.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=fisher+paykel+refrigerator+water+filter
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000102be.bin
b051bce19226974a79522c29070cb01c520944d35d9e3707b8c87783e67d5305		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102BE 17572 bytes
font_01_sfnt_off0001311c.bin
b1bfdf691975fb08a54b1e0126baedc759afcd8a4e7af229c81be7b16a15bff8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1311C 10804 bytes
font_02_sfnt_off00014a3e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14A3E 16792 bytes

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