Malicious PDF — malware analysis report

Static analysis result for SHA-256 024d9085140e3e7e…

MALICIOUS

PDF

74.7 KB Created: 2021-09-13 23:07:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0023062ac9d083eeb64164d6815908e7 SHA-1: b9cebf3d69e902f280312e22958ff449dc28cf74 SHA-256: 024d9085140e3e7e06de9a072afbf526fe20f47c24cdff56007f5739de4e0a66
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with several heuristics indicating it functions as a link farm. Notably, one URL points to a compromised WordPress upload, suggesting a potential distribution point for malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://dakdekkersindex.nl/images/uploads/xepogizuvenunepagepubapom.pdf In PDF document text
    • http://kk-gorenjska.si/uporabnik/file/20494711075.pdfIn PDF document text
    • https://jmbarrenetxea.soinuenea.eus/files/galeria/files/76873131494.pdfIn PDF document text
    • http://www.saaegfpolis.org.br/ckfinder/userfiles/files/78052875068.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/zokajinibiwudaki.pdfIn PDF document text
    • https://clinicscrm.com/img/files/jizid.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/pavovem.pdfIn PDF document text
    • http://anpharma.net/upload/files/kogumexiviti.pdfIn PDF document text
    • https://netlandschool.cl/files/kamazisonabaled.pdfIn PDF document text
    • http://cpils.com/userfiles/file/2236121600.pdfIn PDF document text
    • http://taemyung.com/data/upload/file/84861598330.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/kanikomisanivarasegi.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/irem4jirubc77oacjed7gq2hf2/24312613539.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3dc43e138---4093062431.pdfIn PDF document text
    • https://mkontroll.hu/File/mozujirew.pdfIn PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/63096070286.pdfIn PDF document text
    • http://jiin-torng.com/uploadfiles/20210912095113.pdfIn PDF document text
    • https://naveenent.com/administrator/imagetemp/file/rasatitefibe.pdfIn PDF document text
    • https://ashasuchikala.com/ckfinder/userfiles/files/16959915459.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/11295453686.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/115444a8c63d5cda761ee520cfde3d1c/zozigugapezopida.pdfIn PDF document text
    • http://wmc21.com/ckupload/files/85397736479.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/19711088746.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/tilubad.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/78588918466.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=instagram+me+reels+video+downloadPDF 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_off0000c1ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1EA 10692 bytes
SHA-256: ae74e29ca1ed7abc21db94a511604376544379a036e6e0f5b962614fa809de53
font_01_sfnt_off0000da38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA38 16460 bytes
SHA-256: a7e01b59679566ab0b95fa657c60b5a26f4ab63e93ff26d6eb4e74a32098a2e6
font_02_sfnt_off00010475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10475 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1