Malicious PDF — malware analysis report

Static analysis result for SHA-256 62af08f6dc41da68…

MALICIOUS

PDF

132.4 KB Created: 2021-06-20 06:16:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 591ec7404dc70b18a497c0d5b7faeb24 SHA-1: 091d666ab8f720ad16829291ff86ed10c599cf0c SHA-256: 62af08f6dc41da68944e55075a8d2b2f33b913a926684b947a81978385ceed44
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/5807e36955c9a191728efcbf40cad67f/rudojumifasidudewupo.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a58052a71---tosakewosomavud.pdf
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a33efb5b7c8---xogaratarosiva.pdf
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/7a9253d2881280960ab9c59dcca080f3/59506363625.pdf
    • http://ersatzmonitor.de/userfiles/file/31212492821.pdf
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/33p1sl8gba39114r9116pigh6r/86284498000.pdf
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/5520f83cff60418dbdf3a4603f4b568f/53832710454.pdf
    • http://bulk-supplies.com/userfiles/file/92770165995.pdf
    • http://jagodkaprzedszkole.pl/userfiles/file/64330739667.pdf
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608cfdc76c1e3---72694851673.pdf
    • https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/7b02e242a6aca6c827610f013925133f/jajutojewamejowixobubudok.pdf
    • http://salkim.com/userfiles/file/40633990297.pdf
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160ab2341ee643---pafiwuf.pdf
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072afa1a2db2---xoxedariberedimatekegewux.pdf
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/3jc4o4j30mdhon9maf9gdgo2e7/gitifobitowuberew.pdf
    • http://kuppersbusch-center.ru/uploads/files/54260857821.pdf
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0c08cd9cd---36976521921.pdf
    • https://vresponse.net/userfiles/file/68481943596.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=shadow+fight+2+special+hack+apk
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce9f.bin
8bb2b5e1171b70f29190d7819829321eecfeef82f2c45d1107aea8dc07926ffe
pdf-font-stream PDF embedded font (sfnt) at offset 0xCE9F 86488 bytes
font_01_sfnt_off0001d05e.bin
ada8f3b55b0cb2c7071748a96e87ba07a46f2357c86d29a50e81360c6f25b742
pdf-font-stream PDF embedded font (sfnt) at offset 0x1D05E 5712 bytes
font_02_sfnt_off0001e3f4.bin
c8077654e834d2a707fcbb33642cec041d8f5562ce72aa7961ff17cc0c5773fa
pdf-font-stream PDF embedded font (sfnt) at offset 0x1E3F4 10100 bytes