Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bfa2fd876a68721…

MALICIOUS

PDF

94.9 KB Created: 2021-08-07 17:29:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 14f1945c77aeb7685d53381657465487 SHA-1: ad762a95135b1946c326b9c92a04693ffb129f0c SHA-256: 3bfa2fd876a6872129700a0d65c4ca43044308a6cff908de0a5af37969af8062
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous links pointing to compromised CMS upload storage and disposable hosting, suggesting it functions as a link farm to distribute further malicious content. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate an attempt to lure users with a job application theme to download payloads from these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e2eeec02c---kumopewuvanipakeweweda.pdf In PDF document text
    • https://musikkursus.dk/userfiles/file/lufemerogizuxuk.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160d52971dbe54---ragedelulasawewusu.pdfIn PDF document text
    • http://php-lounge.de/userfiles/file/5316351172.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160da6add4ce4d---gakazoj.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609013d54fc81---nalidonabonijabumufixeb.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/file/1627290124_1.pdfIn PDF document text
    • https://rajakeempat.com/contents//files/36157268083.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087b3284f17e---zatef.pdfIn PDF document text
    • http://heorungminhphat.com/luutru/files/15969359398.pdfIn PDF document text
    • http://haiphongcontest.com/images/files/37554743381.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/fc5dbb0a4b0e690c65ba4efd296708c7/vuzorodojimunepa.pdfIn PDF document text
    • http://piotrkowska77.pl/zdjeciafile/setanikexuditu.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160d20fbe2f3cc---kerotumisubezume.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c90c5f065a---wudogetixavitu.pdfIn PDF document text
    • http://chayka-svg.ru/files/powokigojasok.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/99553178049.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/79534936378.pdfIn PDF document text
    • https://rieker-consulting.eu/files/file/5319203425.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/72900047268.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/a40797b2b8fa73c1fcc5ceb9df91463c/fufomofewi.pdfIn PDF document text
    • http://ruegen-ferienhaus-schneider.de/userfiles/file/jekasuxananovu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=job+application+letter+format+in+nigeriaPDF 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_off000110ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110EC 10784 bytes
SHA-256: 72fcafb44b1a6e9d640fc4c3e095e09d2949b05f257fde2cc5d694ef78db67cb
font_01_sfnt_off00012991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12991 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000141a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141A3 16940 bytes
SHA-256: bf85a857f70706af0e798c5683eb0f824e43bac3b8777fd3225b5f0e7be2d678

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