Malicious PDF — malware analysis report

Static analysis result for SHA-256 91f0364001058b21…

MALICIOUS

PDF

84.1 KB Created: 2021-09-19 21:16:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d0d9ee08f7e60a0047d2c3c5f87cc195 SHA-1: 4e3ee20c52b1828eb8868b7a1473c8e9d3ffdc09 SHA-256: 91f0364001058b219ff20f79d75d798a4e936557136c692aec9cc18d1347cc62
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous external URIs pointing to compromised WordPress upload storage and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://pistant.ru/uplcv?utm_term=game+android+free
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/b05cab0acce048e56e5c84eec42dc788/43461310505.pdf
    • http://plusdesignwebsite.com/userfiles/file/tubapuf.pdf
    • http://savvyais.com/userfiles/file/mefowirawireki.pdf
    • http://keemunblacktea.cn/uploads/file/130158052882.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614483b2ba6d1---65178507250.pdf
    • https://ww150003.linebot.net/upfile/files/20210912065923.pdf
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16142321747c71---46929180135.pdf
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/84793501448.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc2b02528e---nenukaloxe.pdf
    • http://sushiyaslo.com/uploads/files/45420957712.pdf
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/nalesofumemok.pdf
    • https://ruta.hu/ckfinder/userfiles/files/75892906679.pdf
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/jd9mg46b05mbc7c67ntdf2qc21/16405627456.pdf
    • http://www.kroonzuivel.nl/ckfinder/userfiles/files/76382978304.pdf
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/gijawikegipojasiw.pdf
    • http://www.sport-konyv.hu/userfiles/file/71229881811.pdf
    • http://goodfortune.hk/UpLoadFile/file///wivowolatojagurinomab.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eebce0eefe---95582849297.pdf
    • https://makiriaszto.hu/ckfinder/userfiles/files/tomenufosujunebij.pdf
    • http://zkojicin.cz/userfiles/file/7373155880.pdf
    • http://avvocatoandreabruschi.it/userfiles/files/wiwupodezore.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_off0000e64a.bin
c2093fc80058b4bcd5aa6ced391b5128d0a2feb3c16123ae0255d84c08179e3f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE64A 17776 bytes
font_01_sfnt_off00011402.bin
e58fbd411423e6d9093d080fbcd65e06830776d9640e8769156075e3ab80b9d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11402 10244 bytes
font_02_sfnt_off00012af1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12AF1 16792 bytes

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