Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f421166688000d4…

MALICIOUS

PDF

83.9 KB Created: 2021-09-04 06:05:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b1961b335cbbcd26a6564fefff999608 SHA-1: 48a7bfa10cb4b9662db3f0e31601fda7a7943239 SHA-256: 0f421166688000d480a9a6c9cefebf15abe3c58f3a3a0952cbdb95afa361b4f5
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised WordPress sites. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, suggesting an attempt to leverage these sites for malicious purposes, potentially phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d5ecdeb0f91---xajos.pdf In PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/r07gp6kre163ek2fl5b6493fg4/zunipimekunapeduponek.pdfIn PDF document text
    • http://maszyny.pl/userfiles/file/89541324423.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/a7289ee1884cb4972b17e733fa5220ba/tudolixap.pdfIn PDF document text
    • https://euinsuti.uniluxgym.ro/app/webroot/files/userfiles/files/19612079984.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160dce9de52ea3---fovev.pdfIn PDF document text
    • http://arkystudio.eu/userfiles/files/nexuniketudisifumeju.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd3f4ca602---98938392372.pdfIn PDF document text
    • http://alexhoffordphotography.com/temp/files/file/zubogewo.pdfIn PDF document text
    • https://sayurhijau.com/contents//files/bivisazujadadosil.pdfIn PDF document text
    • http://video-cycling.de/files/file/47633990172.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/a9qjv4gu9s9cgt2atnhep24ee3/neduxamagolebadopiloredo.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160859987ba612---keririko.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.com/upload/files/demoxigiliwita.pdfIn PDF document text
    • http://www.ipkameralari24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1346e327f1---22777587382.pdfIn PDF document text
    • http://mosme.org/uploadfile/files/56972508909.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16076d2ba4387c---kanefor.pdfIn PDF document text
    • http://www.jasfec.com/imgs/uploads/janisuxisusaririxuzudita.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/ouhsvpfe1bm6hk50c17n8k8cc4/59733027040.pdfIn PDF document text
    • https://rinducm1.com/contents//files/jolufilo.pdfIn PDF document text
    • http://zonweringbelgie.nl/ckfinder/userfiles/files/41062091706.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021051421145670554.pdfIn PDF document text
    • https://nadamasristorante.it/file/gatiremamevinixaw.pdfIn PDF document text
    • https://kingwaterpure.com/ckfinder/userfiles/files/varezukemavisanob.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/d238508c72bba8ef673b53169e67592d/82210454936.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=hyperbola+equation+derivation+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f64a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF64A 10880 bytes
SHA-256: a4e43585c4293dd58a82dcf25823ed45d107f7fba16c3ff2341677745bbc5124
font_02_sfnt_off00010f11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F11 19264 bytes
SHA-256: 0ee288c44224a7b2730aa46a948ec8f3c7f127823b00c268d48728bc6cea2852

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