Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8869317725bfab1…

MALICIOUS

PDF

87.2 KB Created: 2021-06-26 23:26:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7f91dfccfbc162d03e02d43c36b98c01 SHA-1: ef50bead877a01894ab97de94e02a0bf7eb1ee15 SHA-256: b8869317725bfab184aee5828becd699063638eb7f35cd6dcdb082cf7d46b3ab
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, likely to distribute phishing content or malware. The presence of external URIs and link farms suggests an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://drafthe.ru/uplcv?utm_term=intern+year+survival+guide
    • http://accomplishtheimpossible.com/userfiles_ati/file/kawugemogawosorixele.pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1606dd3ba99be8---kikofakimonepifugijenuwi.pdf
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/she7g2j94m8qdi29b376bo5f8h/mujajusob.pdf
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160afa7252eb9a---tevan.pdf
    • https://guclupin.com/calisma2/files/uploads/fakikawibazeravev.pdf
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/6422df5337bf7ea69f69f3104d9efefc/mokazawiborigimalusu.pdf
    • http://www.vikingmaterials.com/img/kulura.pdf
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c6a410b41b5---13853837066.pdf
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/75002017619.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/a0d68af9bd6ae60eaea796dda6b50250/2461756724.pdf
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec5f3c642c---16762406789.pdf
    • http://a-kamen.com/userfiles/file/18311810189.pdf
    • http://domeinbeverdonk.be/assets/files/file/dizijakolagekoxinojuva.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080c1ceba453---15052355963.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1607a574bb9996---34619641166.pdf
    • https://aadhaarretail.com/administrator/imagetemp/file/19385088232.pdf
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c89e4c87775---88939005273.pdf
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/ac529eea4e457d89a715d57ae94095b9/perugijizinezujikizew.pdf
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/94bbe05351d3ad76d79abef0dbd78e63/75540450273.pdf
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/6ee498d82931f301b2753220f20f35d9/43418163194.pdf
    • https://ka-base.no/images_content/file/nudototuwibozomemo.pdf
    • http://cuacongtrinh.vn/upload/files/39761415182.pdf
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098a1df8afd0---95070607564.pdf
    • http://attlas.center/userfiles/file/lazowagelifa.pdf
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/145b22bf22288509873bce1c252977f4/dojogu.pdf
    • 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_off0000f0f5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F5 16792 bytes
font_01_sfnt_off0001090c.bin
4da9349f68119283a5371b18ac4575e03e5c97f3132d49dda5420d60b0a8bf03
pdf-font-stream PDF embedded font (sfnt) at offset 0x1090C 10536 bytes
font_02_sfnt_off000120fb.bin
a78857e9c7ee1477cc575bb57b3985acf45e5ca495fa0a797fb5b8645e5d6cdd
pdf-font-stream PDF embedded font (sfnt) at offset 0x120FB 18080 bytes