Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bd509733cf2f812…

MALICIOUS

PDF

89.7 KB Created: 2021-07-09 15:58:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b73d7c75d8bf7db37902d321fa60d9e6 SHA-1: 5f4e90163601a937dff71369b55a81f6cb5cc46d SHA-256: 9bd509733cf2f812382df63a3f800500da3dfe7d61c235c419aec9e540e36224
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious. It contains a large number of links, many pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to distribute malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific purpose beyond the presence of these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://occahomesearch.com/userfiles/files/somevedafonuvewivezafijuv.pdf
    • http://fritz-fahrlaender.ch/download/puxatunun.pdf
    • http://cmrivestimenti.com/userfiles/files/62498908992.pdf
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b5fdeb5c6---nemaxoxedonitumewix.pdf
    • http://braciszewska-klimek.pl/fck_files/file/37290264509.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/c0b4f0ead059c65398937cd06aa0c996/32660049055.pdf
    • http://reicar.dk/userfiles/file/jorujixepizop.pdf
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607e19b519d9c---81230284926.pdf
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160847a92ddf42---xonatepolog.pdf
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/6m7i7h9t6ohtlvhm1qtmc0dhr6/foxudekaxixuwobafivumoba.pdf
    • https://vico-inmobiliaria.com/ckfinder/userfiles/files/90713618745.pdf
    • https://ferado.vn/userfiles/file/35828141706.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160ad30c5a3a3c---nesiliminoruposub.pdf
    • http://zimaletto.com/uploads/file/kobojobumoromadum.pdf
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/ffao0tdvo9hmohrqio6j7c7sq8/20479546951.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160763f05ce0e0---30896502099.pdf
    • https://sinhadventure.com/uploads/file/3186133225.pdf
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/6salf5hl69t191eg1pm8lceeqb/kidepowetobap.pdf
    • https://nenanhduong.vn/Upload/files/28230124091.pdf
    • http://asea-admin.com/_userfiles/file/20210508164537.pdf
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/3cslom02encfspiejtbd5fbumg/38851466438.pdf
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/fpv63q2klhf1pg5bjd0bahkkc0/pojerar.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=different+types+of+transformations+in+math
    • 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_off0000fb14.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB14 16792 bytes
font_01_sfnt_off0001132b.bin
a2cd54f41830ff3692825abb23e743e36c108bbae697fbfcac5bc7dcb3fffb6c
pdf-font-stream PDF embedded font (sfnt) at offset 0x1132B 10692 bytes
font_02_sfnt_off00012b8b.bin
11ee542f47787622fe533f0ce8adb1f31db38e1a692c96276a6d19816fca5ef1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B8B 17332 bytes