Malicious PDF — malware analysis report

Static analysis result for SHA-256 829c1743b3b34dbc…

MALICIOUS

PDF

67.9 KB Created: 2021-09-04 23:12:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ecf6b2a4118454222c40a0e85c390568 SHA-1: 02bc3acc411588ac1147cb8a1e29b8fda1559c08 SHA-256: 829c1743b3b34dbc83fd6af4f8642388a135e9fc1f5fe2169470b10dcbb6a968
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file exhibits characteristics of a phishing lure, including being image-heavy with minimal text and containing numerous embedded links. The heuristics indicate it's a link farm pointing to compromised CMS uploads and disposable hosting, likely serving as a distribution point for malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, possibly involving the download of a second-stage payload via the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 https://pistant.ru/uplcv?utm_term=ejercicios+comparativos+y+superlativos+en+ingles+6o+primaria+pdf PDF link annotation
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/10012914281.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/5l69lkrqjaoo5cell4s23oain0/vokomotel.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/newene.pdfIn PDF document text
    • http://viewcs.com/partner/upload/dextfile/wobudivonerudurujanab.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/f73b78329c3aed0c13abcb39abcc415f/vifumorajofokowu.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/56237313169.pdfIn PDF document text
    • http://dakmet.pl/upload/weladopazavolejo.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/977b8676c3bc21703eb8e250d2cee9b8/kimilefomed.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/33065170586.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/6bd13bb477d40d3310fae4a980a8eaa3/batefigikedudi.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/225521592.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a986a940bc7---70586138308.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/4acc0e95e648eafa0263d5910da36803/limijinodo.pdfIn PDF document text
    • http://polkovnik.su/upload/file/82411082962.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/r1qai50iaibrjp3r7b4vgcpnhi/93032588355.pdfIn PDF document text
    • http://splogservice.ru/content/files/61096957527.pdfIn PDF document text
    • https://mehreganimaging.com/images/upload/files/noramagatud.pdfIn PDF document text
    • https://on-call-anatomist.org/ckfinder/userfiles/files/29831169660.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087ef0c2be57---56291702431.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/50417d6ce6ad8adbaeab635080539c3f/foren.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-6-30/20210630005801996596.pdfIn PDF document text
    • 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_off0000ad30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c547.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC547 11524 bytes
SHA-256: d9980bb3bece49dedd661c11d5c7848958bc8d8a943ad1d415e37683784f05b4
font_02_sfnt_off0000e05d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE05D 13724 bytes
SHA-256: 541866f82f6bbfd3832a91a1b0532ca0bcee1252cdeef13ab497966cce9f26de

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