Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8dd6c12facc1ef1…

MALICIOUS

PDF

123.8 KB Created: 2021-09-02 23:12:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 53bf60d5346131e0a5952076bc9b7dd6 SHA-1: 3a81a8ba4abada553d571e4ab708b4fc79d18f3c SHA-256: a8dd6c12facc1ef1b051e5e175522caf710df6746609724aed82fbcd377107a4
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple distinct hosts, many of which appear to be compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggest an attempt to leverage SEO or distribute malicious content through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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 http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095d6c25dede---leturefidofiduliruj.pdf In PDF document text
    • https://rajaketiga.com/contents//files/vagenav.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c8687470038---bosizajemebanovuromojeta.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607daf0b31319---boxulisiditi.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/161068ef3825dc---87924986992.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef3e52fe06---vagiwizutaxoz.pdfIn PDF document text
    • https://noddy.nu/images/file/53728434040.pdfIn PDF document text
    • http://generaldistco.com/images/file/latino.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160968225e8d0e---79441872663.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/patufabaxusozatoxomafow.pdfIn PDF document text
    • http://campcolefamilyreunion.com/clients/82065/File/99632845805.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/bgdhucj1tc3osef9c1gdji0r7e/numimebijo.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16076e19d1cd4a---79922488665.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/261632348327f04626d22cba67ce9001/bosifopaxagax.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160863cf7d7bca---4755198652.pdfIn PDF document text
    • http://esipro.be/userfiles/file/powijatobudosoti.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608af4ef70bd1---lolijibizatinomiduwiborav.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/d966ab0a21ed84c0d75cd4499675112e/56062518864.pdfIn PDF document text
    • http://mptech.vn/ckfinder/userfiles/files/fajug.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160907bdc1d958---34600264063.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/8d19caad9ccef3b549d865a0c61ab117/zikubax.pdfIn PDF document text
    • https://danielfelber.ch/userfiles/file/beserikisifol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=cours+de+droit+administratif+cote+d%27ivoire+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000159b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159B4 10964 bytes
SHA-256: 6e00ff4c9b5ebd00a208a0751aa704e2e93a7286ffdddad3dce10b1985eddc8d
font_01_sfnt_off00017342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17342 16140 bytes
SHA-256: 2e40c969e06661a541bab8cef666ebc654a0d8416a3222ef5092975c876ce786
font_02_sfnt_off000188c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x188C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001a0d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A0D5 25604 bytes
SHA-256: 1c5af8107fb7a1cb6325ca89cd1203755ed6ad7e0afaca5553b644e0d19f78bd

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