Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ad67a10499b1a86…

MALICIOUS

PDF

85.7 KB Created: 2021-09-16 22:03:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 4b2ef2720ffba8d28ee735b6b84ca5ce SHA-1: 00a99c9aa13e65197e73d77bc66e336d2ac1f0ac SHA-256: 6ad67a10499b1a864ca3580f0cfb2a6f22729e032867a83ba5514dcd260a7e40
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://metnar.pl/web/uploads/files/fajitufogofaguwevure.pdf In PDF document text
    • http://interno-kazan.ru/upload/files/siwerela.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc44c9c6be---49988270785.pdfIn PDF document text
    • http://topbondtape.com/uploadss/file/jogov.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d05463cf8---mopobepumugofuf.pdfIn PDF document text
    • http://poliinc.com/upload/files/10493220263.pdfIn PDF document text
    • http://88cpap.com/userfiles/files/97761319405.pdfIn PDF document text
    • http://opsir.eu/files/file/kozepivinukamosi.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/8767eb6147aece779d36f82b381c0e29/kekunet.pdfIn PDF document text
    • http://assotechne.eu/userfiles/files/90816927640.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-9/20210909041308964186.pdfIn PDF document text
    • http://mextro.de/upload/files/31645272700.pdfIn PDF document text
    • http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/tugagegaxulubukefoxakazu.pdfIn PDF document text
    • https://ubitanduk.com/contents/files/70928660195.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/82477847735.pdfIn PDF document text
    • http://bowie.abwingsmd.com/uploads/files/xowewerak.pdfIn PDF document text
    • http://mprime.net/ckfinder/userfiles/files/99954453364.pdfIn PDF document text
    • http://china-spec.ru/userfiles/file/ginunidujolomaki.pdfIn PDF document text
    • http://getvisa.ru/images/File/70095361733.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-14/20210914094440761164.pdfIn PDF document text
    • http://slsnn.ru/content/files/50793739445.pdfIn PDF document text
    • http://xn--80adic7alej3d.xn--p1ai/userfiles/file/ruseruredomiwefirosi.pdfIn PDF document text
    • http://shipsupply.ru/userfiles/files/39847811858.pdfIn PDF document text
    • http://www.ruben.pl/ckfinder/userfiles/files/64133089779.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135bee8ca601---25591246785.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/16252892717.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=best+chess+app+android+multiplayerPDF link annotation
    • 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_off0000e74d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE74D 18476 bytes
SHA-256: d1e2cda7a7d955825e6da7fe06a9a2b2a7990bebe5c92894918ac6a23459cef2
font_01_sfnt_off0001174e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1174E 11044 bytes
SHA-256: 83860cbf9bc5925ca00873a96be25d36d3ebbad85647d1c1826d0f2d6acc213e
font_02_sfnt_off000130e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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