Malicious PDF — malware analysis report

Static analysis result for SHA-256 11ec38d2f9ca39eb…

MALICIOUS

PDF

101.1 KB Created: 2021-07-29 10:32:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 523d40db091f95c6b84934f2b9c110bc SHA-1: 8060b9682fd56a728463a57ca9ecd046642755a7 SHA-256: 11ec38d2f9ca39eb036fa30979ffc5cf5689633d2f027ab9bcd60998335cc1f1
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, with the file being identified as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c69ac312519---99640306531.pdf
    • http://gdlianyu.com/uploadfiles/file/vawobe.pdf
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/7498aa538a1c5d1f9d3bdafbf9593b88/7008151478.pdf
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/79228857937.pdf
    • https://www.bevillelecomte.ovh/ckfinder/userfiles/files/39059857124.pdf
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a57aef1b9b0---gazodifagovozinugowofusoz.pdf
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1608c35a169ef2---lajiminebegawud.pdf
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a83c1def66d---polazumetikuwomulabinupon.pdf
    • http://www.motorradfreunde-toggenburg.ch/up/files/15737733924.pdf
    • http://1utilaje.ro/mm/file/88124248173.pdf
    • http://ducnhua.com/upload/files/sewilezafe.pdf
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4014197b62---74402256888.pdf
    • http://maplewoodmachine.com/clients/1/17/17f0ea2532424b9b8bf99baf53cd3763/File/25058642037.pdf
    • http://toastwarenhuis.nl/app/webroot/files/userfiles/files/jupemoninat.pdf
    • http://shinex-auto.com/userfiles/file/bagijanekirapedulam.pdf
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/486cc4de3a392bcf59a1cf7f6bca30de/81018109752.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d87d917f5---jovobotajamobedisag.pdf
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbd1b2bbde2---lapalovabi.pdf
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/fc6cf1bbf2e3ed1cbefbd72aeeacc72e/dasedipoxaxebopesup.pdf
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160faf9071e0d3---29129363189.pdf
    • http://mientrungland.net/uploads/image/files/77441460210.pdf
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/7mpf8am5ed4vuq7rv3dq702c07/49420027408.pdf
    • http://sdds.be/userfiles/file/wakosuk.pdf
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/4457c034e9994d47e1b2b800bfe0dcba/66581484442.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=examination+day+irony
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012ae9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12AE9 16792 bytes
font_01_sfnt_off00014300.bin
f6f8d319dc2ffe9a61ef7205cf9621beeb84576ecbaf6bfb7a7eca875505b189
pdf-font-stream PDF embedded font (sfnt) at offset 0x14300 10260 bytes
font_02_sfnt_off00015a03.bin
26f7860b510229dd95cf4f49a835a1a951270273b45d928d38de3f516e8d97d9
pdf-font-stream PDF embedded font (sfnt) at offset 0x15A03 17268 bytes