Malicious PDF — malware analysis report

Static analysis result for SHA-256 20043298fc54fd96…

MALICIOUS

PDF

80.9 KB Created: 2021-09-07 15:57:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c48dfc9fbdb5bcf42bb9cf7f691b72a7 SHA-1: 69187832b5f7e2efe86aadd9f3171756ec9c152b SHA-256: 20043298fc54fd96dc2e85b2087deb592961a695200e62b21ef68f00921cd5e8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs pointing to compromised websites and disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO spam. No scripts were extracted, and the document body was unreadable, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://coretry.ru/uplcv?utm_term=atago+pocket+salt+meter+manual PDF link annotation
    • https://burgas-remonti.com/userfiles/file/zaxulokukinivalodi.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/bpfouf3ia10bc3tvc0dbe5j8pd/77288165877.pdfIn PDF document text
    • https://emmaushuis.org/pages/jesuzukuxagugefetato.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160702d8f46f6f---89964836543.pdfIn PDF document text
    • http://www.motionmantra.com/userfiles/files/rabebaparinu.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1612872086c882---dukuw.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2e2b90016---taven.pdfIn PDF document text
    • http://dsacare.com/admin/uploads/file/mutalapukafeferojulusi.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/21056333738.pdfIn PDF document text
    • https://gachbinhduong.com/upload/file/fifodevijitegukud.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608515abbeba0---rotumojubuvenin.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160850bc0a9e55---talaxijokifekaxejodanako.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/6a7655da9a70c938f004af9eec0a5472/86708646449.pdfIn PDF document text
    • http://wpscrm.in/uploaded_files/userfiles/files/83819211109.pdfIn PDF document text
    • http://donghotam.com/luutru/files/40874276961.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a4f853002---vevijozariduzapilomimok.pdfIn PDF document text
    • http://harissarantis.com/userfiles/files/71187801952.pdfIn PDF document text
    • http://enricobarraco.com/files/60106396251.pdfIn PDF document text
    • http://honda-vo.com/upload/file/63264622416.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/fimox.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/58131919721.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/ofg6mmulk792eo43gub0aho7nu/xuvebuzu.pdfIn PDF document text
    • http://moscowfashion.net/content/xuploadimages/file/17267092713.pdfIn 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://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_off0000d2ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2AE 10796 bytes
SHA-256: af435fb1c8363b6e52eba30db6ad2a6f590263b78076b20e3540e0e1674b00a0
font_01_sfnt_off0000eba5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA5 19364 bytes
SHA-256: 4a960e1600b0e37e30b24470246c0384f9a5fb4aaacef71f09d8597160ff405b
font_02_sfnt_off00011e7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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