Malicious PDF — malware analysis report

Static analysis result for SHA-256 44a3aa431ccb2aa2…

MALICIOUS

PDF

84.2 KB Created: 2021-08-21 05:02:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 60881a0b74511df47d293e407e016d9d SHA-1: c208be8b6c587f1fa78d4d59f1189e4ca9e80b19 SHA-256: 44a3aa431ccb2aa23b8b53a9039c503a994090a6416f4ea5a32cc06698bd8212
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is a PDF document identified as malicious by ML classifiers and ClamAV. It contains numerous external URIs and link farm patterns, suggesting it is designed to redirect users to potentially harmful websites. The presence of compromised CMS upload links further indicates a malicious intent to host or distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://pixomot.ru/uplcv?utm_term=pokemon+storm+silver+egglocke+save+file+download PDF link annotation
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/4572296d1b2db81b46b020ea154b4dff/97119965449.pdfIn PDF document text
    • http://herfon-machinery.com/images/ckfinder/files/20210814005815.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/7qjhrv1ttchigr2ai1lu7g5eh1/70051649039.pdfIn PDF document text
    • http://maybaobidinhdinh.com/upload/files/17952494726.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/tvt2roqidms7brfadjjm2fpnt3/wowobitosisavaxedu.pdfIn PDF document text
    • https://cristalensi.com/public/File/11632773162.pdfIn PDF document text
    • https://floridahouselottery.com/test/userfiles/file/87262445870.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/favenugusesixolenew.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2665568b0---53977583196.pdfIn PDF document text
    • http://conflictfreeelectronics.com/ourprojects/chowki/UserFiles/renuka/file/43137483070.pdfIn PDF document text
    • http://ceroki.com/image/files/69433975490.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b117785fe58---29865380832.pdfIn PDF document text
    • http://haithuanphat.com/uploads/files/78182552731.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609e32b3e0a93---wedopiloz.pdfIn PDF document text
    • https://alkathirilaw.com/userfiles/files/sekagunokono.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16082aa9cc6def---68729399372.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/56d42689161aeec67bd95437c106bbc6/vosataked.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0922802001620199401.pdfIn PDF document text
    • http://kawoka.com/userfiles/file/85620009843.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/sepapitupogonuwa.pdfIn PDF document text
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/merevotibegi.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dcaee163f07---kirapivaduxabamegevivop.pdfIn PDF document text
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/puf262p106mjit54nn0br2qtqf/xopibojeleresetonaxa.pdfIn PDF document text
    • http://ecilingirler.com/resimler/files/31486532286.pdfIn PDF document text
    • http://usateatop.com/_upload/files/51655786754.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_off0000e286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE286 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA98 17688 bytes
SHA-256: 75cbd61d0f32891987d92bf251e37d35bbce5432be78d5a035918ada8818fd49
font_02_sfnt_off0001290a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1290A 11064 bytes
SHA-256: dfd8113664e8ebbcd092b9e22d3616a560a81d1bec1b46e5e3d0ebd4e6c54e19

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