Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9635c5baf28c55f…

MALICIOUS

PDF

86.8 KB Created: 2021-09-02 04:55:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 50ce8b23c7a03b0e418df8b2b3092800 SHA-1: ecd26b6533a5a15fd8489c0b8d60307e99f79dc3 SHA-256: f9635c5baf28c55fd324c7882c3564b611b3ecd990c0af55df5ddc1be13a254c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to distributing further malware or leading users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://alltechsro.cz/files/jewubijixo.pdf In PDF document text
    • http://antonellascarpittadesigner.it/userfiles/files/zarebajitif.pdfIn PDF document text
    • https://irantruck.ir/data/file/99362449551.pdfIn PDF document text
    • http://folientastaturen.pl/_data/file/minuwulajigurebezazixate.pdfIn PDF document text
    • https://www.bbmnetlicitacoes.com.br/cms/ckfinder/upload/files/66723077068.pdfIn PDF document text
    • https://diphong.com/uploads/papadezapegagugamuso.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/77170261554.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/puzozamazobavakodedejik.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/05fbbb85c52c7c10f24a4f39a3c57dc1/kesetavegos.pdfIn PDF document text
    • http://studiomistretta.com/userfiles/files/62983563576.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/lefazepibosefajes.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160e6a84360c44---taxidetenozorafavoz.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/979da1aaacab4c5b7af70aacb096b0a6/vawodojefidupuwulewiremis.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16079b5910c5b6---tiwekuj.pdfIn PDF document text
    • https://tidymoney.com/ckfinder/userfiles/files/woxejofipisawepoxaxatato.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c8fbcbe0d89---99167999534.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/fc098d8d2eaed18f4b8c7bc2ad4715e4/23802159498.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba9144943e---85917186937.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/sotina.pdfIn PDF document text
    • http://ccsl.asia/files/90477077083.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/nabajubifuroxajenuju.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/masenoxuviletebakulopa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=country+with+black+red+and+yellow+flagPDF 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_off0000e9cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CF 19108 bytes
SHA-256: ccadcfc72bb38862c6e3dfdacd7140fb04650d914fd779d6f87f7ffa537dea7b
font_01_sfnt_off00011be3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE3 11148 bytes
SHA-256: 288656f073dc5ff94837bb20de6cf912ff98a5d1b3a6c926384d59fb7ace0e74
font_02_sfnt_off000135c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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