Malicious PDF — malware analysis report

Static analysis result for SHA-256 1459902e400b9ea2…

MALICIOUS

PDF

75.6 KB Created: 2021-08-23 17:25:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1cc0f2ea3c6885b709d102ff2a5e09b6 SHA-1: 464997cf4839ed3703c7fcadc7cca91f759c9e19 SHA-256: 1459902e400b9ea2e02ce81b7427028296985f9772dc292b588ad92482380c5a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, further obscuring its true intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9931

Heuristics 6

  • 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.
  • 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://laborke.ru/uplcv?utm_term=ferry+schedule+from+coupeville+to+port+townsend PDF link annotation
    • https://hw-power.com/uploads/ckfiles/files/60dd9a0024268.pdfIn PDF document text
    • http://michaelwilliamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/27560008281.pdfIn PDF document text
    • https://alzubidi.com/userfiles/files/domiwovulefixakiwetogukev.pdfIn PDF document text
    • https://www.sibirprokat.ru/ckfinder/userfiles/files/nevowonisizavowenolenut.pdfIn PDF document text
    • http://www.lugashotel.com/data/editorfile/mojatagufonexe.pdfIn PDF document text
    • https://ev-owners.jp/userfiles//files/vokudepenozusotagek.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/cd0b188edcc4ae0bc72a624d87c8748a/86368369920.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160770fedbca76---dusulazu.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/baminegekoxibalov.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/26443467156.pdfIn PDF document text
    • https://franciscojaviermoreno.com/DocsCKeditor/files/2336937587.pdfIn PDF document text
    • https://poojaindiangrill.com/nbloom/fckuploads/file/66061773843.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/61916245343.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16080dfe210fcb---9936245487.pdfIn PDF document text
    • https://thehideawayresortpattaya.com/userfiles/files/salepijovuliwilekojajigam.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160848b13cc303---sotaxodogusinujidovidi.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/2fb7e485dce5aca34ee42345b98513f1/sodetuzosap.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/dasodefawo.pdfIn PDF document text
    • http://zimmerei-possert.at/77510598541.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b021efd5d---38054938457.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160e0e4b99a4f1---rodexanetivawuxivab.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/9p5tcsj68pag8c73273m4552bs/jiwedekisusajixukiwixoso.pdfIn PDF document text
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rusopibamadosov.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/vnc1t7q78mk3uhqq22ude3o3kf/xomurunoxesisozemadebomo.pdfIn PDF document text
    • https://www.syria-report.com/sites/all/libraries/ckfinder/userfiles/files/14503970417.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161059c0ca158a---lenejorisafewelukolenik.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf4598511b2---71958714142.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_off0000c522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC522 11064 bytes
SHA-256: c53f9692a854e27eb6134f5e772d11d4f34b096071324218b65e003ab07a08c8
font_01_sfnt_off0000dec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC7 15080 bytes
SHA-256: 90a4ed97cb753bef458344c29e822654b866a04dd817912f95fc4ff62ad4e5be
font_02_sfnt_off00010580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10580 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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