Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a95f0bf36234132…

MALICIOUS

PDF

75.8 KB Created: 2021-06-21 18:41:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: be86105a8f535bb054899bce07fb9ae6 SHA-1: 70dfed4a23be8a238141b4359544243578fe0774 SHA-256: 4a95f0bf36234132797663d33aab84c219e3ef64c624b929af858075b285915d
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations, suggesting a link farm used for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious content, likely a trojan disguised as a downloadable movie file. No scripts were extracted, but the overall structure and URL patterns are consistent with phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://synerhu.ru/uplcv?utm_term=duniyadari+full+movie+download+hd+1080p PDF link annotation
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed59f27fb4---28265848546.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609b17301900e---48042596414.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a9781107ac4---43296462298.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/2b62fd4791b310ed2cd9bbafb29b36a6/96725865491.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/h9om05ra5rk7ddtaab5bgqm714/48367985896.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/8d0b8ec212aa4fb47f3d3d090af7aac6/rewesunamusaropokuwubon.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/b003f86fafe99f0a6d5f9f81b2e6e86d/11926531298.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/7b7bab0c83024dc3cb343ce5f9b6394d/razezizofizez.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf37a726a2---musoreka.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/9843d0edadc1120c0713e0de6e5072e3/puvamizonixarizusitufeka.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086274098229---93378741269.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/6n6covc6eotnl9grsv8qrkgg5p/35091224251.pdfIn PDF document text
    • http://joyearland.com/ckfinder/userfiles/files/limupakutogin.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/bukusavonel.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/3e0aa15d18ff21c78da357e156c25cae/31441855073.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/r2n096h6o2e5bgimimqonclhnn/kazomoziwaroweronipakib.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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE956 5744 bytes
SHA-256: debe23b34ef5a09fbdbf054a0bd026da88909bfaa29bd31b106d8ecd254ed73e
font_01_sfnt_off0000fce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE7 10884 bytes
SHA-256: 39488c2f98550c3d507a2a05b251feb57163d2e925d909b2588c2d2bfda2df0a