Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc0aff93dc9cb390…

MALICIOUS

PDF

99.1 KB Created: 2021-07-02 18:52:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7b71ffe9651ce62dfd37c535a6552492 SHA-1: 012a9abdb3c649652f1e09ab9ad5f19f90971de0 SHA-256: dc0aff93dc9cb3900facdf446f47f98524fef0064eb1beea1dcbc8bf43601e88
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, directing users to multiple compromised WordPress upload directories and other disposable hosting sites. The primary goal appears to be to distribute further malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://adreshosting.com/calisma2/files/uploads/nolapufezisito.pdf
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/65292300974.pdf
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/c949aaf58abeefefa25041753a3f6d0c/99311955796.pdf
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160702fc09c82f---55693712826.pdf
    • https://hogies.com/includes/template/uploads/file/236713324.pdf
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/89231144859.pdf
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/f47ba3b8ae5b90e1a93bb340b57464a9/galibofafesiw.pdf
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/a151d65505c143ecdc4ffa63e2f70f98/80843878078.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9863715be8---fobajasojadasiveguwowifu.pdf
    • http://cdwy028.com/uploadfile/file/20210528105810.pdf
    • http://bfr-bialapodlaska.pl/userfiles/file/sunolemefixiwunipemi.pdf
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075bee8bc676---taxixolifalotu.pdf
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0612/03631bfc7907e7d22dea2e35d7b84fb7.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/9278fd80751892cfd517c1166c325968/fudomat.pdf
    • https://ludifrance.fr/userfiles/file/28306385412.pdf
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/f3765dfbff3d70a3ac4b91522472bbdb/tiruzevofo.pdf
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/nqeudm8ff369rucjssqt1k0l0u/43409902707.pdf
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a61a8f55eec---49392723629.pdf
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0a9c3ce4c2---54201069347.pdf
    • http://boothbayharborshipyard.com/userfiles/file/83384037271.pdf
    • http://agendaalzheimer.org/files/galeria/files/20336148308.pdf
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/qiu2g0vqaeil1olk6pjfk7lucj/wupik.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=indian+cement+industry+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_off00011e20.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E20 16792 bytes
font_01_sfnt_off00013637.bin
be15412f878f5a4df106759aca78302b5c90b17ba113b05ddc32b87d9583e758
pdf-font-stream PDF embedded font (sfnt) at offset 0x13637 10780 bytes
font_02_sfnt_off00014f07.bin
80340755470558416706f4787e7ca980ecc407d061d2ea9aa172e8a609d64676
pdf-font-stream PDF embedded font (sfnt) at offset 0x14F07 18104 bytes