Malicious PDF — malware analysis report

Static analysis result for SHA-256 a13df217d40c7947…

MALICIOUS

PDF

81.9 KB Created: 2021-06-10 11:19:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: d66eba29e76d5f690c09bdb37b0f3cd7 SHA-1: 3a1672755b3ba9cd4f5298c351702404bc2914c6 SHA-256: a13df217d40c7947b96ea056d99c6dafff86155d5650540d5e117e1641a98d26
156 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm used to distribute malicious content. The document body, though heavily obfuscated, appears to be a lure for movie downloads, a common tactic for phishing and malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://crysiq.ru/uplcv?utm_term=blue+is+the+warmest+colour+2013+movie+download PDF link annotation
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a2226e1ea75---62137964022.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/lajogilazuluw.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/6041beb8c31899533321c5838bf04860/50332889186.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/5h5574a9vcrpnt8ru97fflppsp/zawaxev.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b2b3e71159f---xosisuxox.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16071a8376fba0---54878868897.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a721a191f1e---50149046227.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160abc0a0a8cb7---18417205786.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a865e4cf9e2---takebobugolasakuja.pdfIn PDF document text
    • http://hyperasp.net/userfiles/file/40236922561.pdfIn PDF document text
    • http://wijnhuis-vaessen.nl/site/data/ws/files/taran.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/kisopinetokadixazikunaxi.pdfIn PDF document text
    • http://scheiden-maassluis.nl/uploads//file/kivuvudoxataxikirag.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607505aac0417---tofomesejojusag.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFA 6744 bytes
SHA-256: 048fb1891f432488516cd811e7b04d68e7d39e548ca3495625137f8fb0c23ff4
font_01_sfnt_off0000eedf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDF 5872 bytes
SHA-256: 91d73f69cfbe7318a5dfd862e583179c7af912a70e3969e4fc22b9c41ace389c
font_02_sfnt_off000102be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102BE 4028 bytes
SHA-256: 3fb6ed790455ac42f7be10d603b2a07ad4767446850bf232ea55ffe12247e89f
font_03_sfnt_off000112ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112CA 11064 bytes
SHA-256: 21781ebf2f5f02124437be0ca4fe7959a8ae5fc03822d657cf4d93e83bc14cdd