Malicious PDF — malware analysis report

Static analysis result for SHA-256 25e56de9054cb625…

MALICIOUS

PDF

68.5 KB Created: 2021-09-15 11:21:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3affc15c0babb7d810f6d5b8cf574696 SHA-1: 9924c4c2982bc86b29a900c327fad4454b22fae4 SHA-256: 25e56de9054cb6258815e30d8616b7b02d0158dfba047311363eaa2500af6d3c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous links pointing to compromised WordPress sites, which in turn host further PDF files. One of the extracted URLs, 'https://infrive.ru/uplcv?utm_term=vista+vpn+premium+apk', suggests a lure related to VPN software. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure suggests a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://infrive.ru/uplcv?utm_term=vista+vpn+premium+apk PDF link annotation
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410d6eebd60---gubowe.pdfIn PDF document text
    • http://chaodontuonglai.vn/uploads/ck_upload/files/67883086873.pdfIn PDF document text
    • https://xinpayflow.com/ckfinder/userfiles/files/71439402985.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/xepadezokag.pdfIn PDF document text
    • http://sanphamhanquocymy.com/uploads/files/kosexiporilegonikudizone.pdfIn PDF document text
    • http://peak-experience-europe.com/images/blog/file/bugup.pdfIn PDF document text
    • http://hatdesechia.com/storage/ckfinder/files/96242904990.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5b16209e2---8059490040.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614022de1f92b---vununowefuvarodexinenufan.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/i1vm1h28hfipbbifsoufc28klm/ximusupewamudodawe.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/5c67299daa5d620cf1d7e703966537b9/56395628844.pdfIn PDF document text
    • http://exteractif.fr/pictures/2/83245131773.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/gubelukelika.pdfIn PDF document text
    • https://namratalakhotia.com/userfiles/files/lizokozodowesalo.pdfIn PDF document text
    • https://nbcmedia.vn/ckfinder/userfiles/files/73528027715.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/wigoziturenagibulonudegin.pdfIn PDF document text
    • https://newline-eg.com/userfiles/file/pujusi.pdfIn PDF document text
    • http://xsteelstock.com/d/files/dexonilutorulinozovomi.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/0c3303efcbcc54067a37ad513a91b036/wesixogunedapixezagut.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef9b71bfd1---31336579382.pdfIn PDF document text
    • https://bruceleevideos.org/images/file/82725061170.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/89694485243.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_off0000adb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADB8 15388 bytes
SHA-256: acb34ebf8fec1d5977e912c10dc67c09803c76ab165245c7011f274eedc48299
font_01_sfnt_off0000d367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD367 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7E 10472 bytes
SHA-256: 66e2f4c4fa675d32a9a43e502d948a9599f7605902d0d1bc514e9d070ae661c2

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