Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2a1461d8c26de8e…

MALICIOUS

PDF

80.8 KB Created: 2021-09-02 20:20:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5d6673a27ed4537410b0e4faeae767d7 SHA-1: dcee86ae1fb4adcb24e344049d7a4c2d759441cc SHA-256: a2a1461d8c26de8e1246c251343cf1164329242a5cf2523b9a0aae90c007df72
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links to compromised WordPress sites and other disposable hosting, suggesting it is part of a link farm designed to redirect users to malicious content. The presence of multiple external URIs and the compromised CMS upload links indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://laborke.ru/uplcv?utm_term=jeux+tables+de+multiplication+pdf PDF link annotation
    • https://mandarinkinesiska.com/userfiles/file/75841967794.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161294bfd02147---telunuxetino.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/bgs0e4mrhfl9eal536i7abpnpl/sidejapeliguxo.pdfIn PDF document text
    • http://balone.net/_upload/file///zonidiseguluwo.pdfIn PDF document text
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/40671938866.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1611c11cd51859---vimaravefof.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/vujigujuvirafonip.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/jukenemat.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f5dc6152c0e---44805516109.pdfIn PDF document text
    • http://zafirkort.com/uploads/files/12197916268.pdfIn PDF document text
    • https://www.sudoku-cool.com/ckfinder/userfiles/files/derarivisosibovu.pdfIn PDF document text
    • https://hirurgija.me//files/xelinatojute.pdfIn PDF document text
    • http://veterani-pushkino.ru/userfiles/files/rabemurowuragije.pdfIn PDF document text
    • http://abwvictory.com/uploads/files/wokuto.pdfIn PDF document text
    • http://enjoyisagenix.com/ckfinder/userfiles/files/45011610730.pdfIn PDF document text
    • https://pui-vital.ro/msg_media/file/52038486341.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/lkc96dbqk1osk9medv2u7htl0p/somolo.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/187927fc5d1a534328158872f2812e41/xevovuwad.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/gojetawesisovome.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/dsvgtakg3u0nd90jujc54nqn90/pilefolotenekagesag.pdfIn PDF document text
    • http://gdgom.com/upload/file/2106252359051656235h65e9grd5ez.pdfIn PDF document text
    • https://invest.pl/userfiles/file/wamolupotofijemifapena.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/posajovomofimudomogi.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16091d64149884---15357073276.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e40617c9b9---9546831788.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_off0000d887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD887 17112 bytes
SHA-256: 2ae9b6228cdd42e22d1468c81c0374527b8fa66b39de43855574a93d380d07ce
font_01_sfnt_off00010461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10461 11012 bytes
SHA-256: 414853715a161c67151709f03a3e5f62bdb9f88525a089c00ac96ccf961d7528
font_02_sfnt_off00011dc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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