Malicious PDF — malware analysis report

Static analysis result for SHA-256 4df22702528eada5…

MALICIOUS

PDF

131.3 KB Created: 2021-08-20 20:03:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b118fb7d80a09ed2403877052b3270f9 SHA-1: 5927ea2823c4f28dd84e9995f5fb0656761dbe3b SHA-256: 4df22702528eada58cfb4697f75c5a3e73754d13aaadc38d65a3d7bec9ff94a5
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple external URIs and link farm heuristics confirms the primary attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9962

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://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/3oqs2qb2a24sgds0gbn344bnkd/44763734990.pdf In PDF document text
    • http://immopolignano.lu/images/85120180648.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/e01667e24ae2e7cca41b56f4973b735d/tufikativuwo.pdfIn PDF document text
    • http://lucann.com/Upload/file/13939456916.pdfIn PDF document text
    • http://er-trans.com/img/produkty/files/metinusavixunisobu.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/mf7fvucbi4i22psbk578op8777/32337922844.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aaad805cdb---40907097739.pdfIn PDF document text
    • https://kamarkosong.com/contents//files/guzutetevu.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/407715f9562461bede9bb30baee77ce3/mojuzaxupejipifolozasuves.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4232bd6b6e---xixowowutaditawofatinusi.pdfIn PDF document text
    • https://coevent.ru/upload/files/zasukosoxuji.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/a3e40a49b111e3f951dc0e71193c9b23/40340887705.pdfIn PDF document text
    • http://yucehukuk.com/resimler/files/51345383512.pdfIn PDF document text
    • https://gtnet-engine.com/ckfinder/userfiles/files/99959758123.pdfIn PDF document text
    • https://sofanet.ro/ckfinder/userfiles/files/vomoraduvodupemage.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/perukib.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/4bdb8fa82c2f241f7a16980d876811e1/63037475593.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1cb533702d---silisa.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/990adf5212ccff51b54197edc254c1db/59049628272.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160adce975dcf6---tuwerevisa.pdfIn PDF document text
    • http://synerfreight.com/syner_upload/images/files/migawona.pdfIn PDF document text
    • http://livestocktool.com/d/files/fefuxe.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/34630710960.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/jorujet.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160db083e5725d---68818575315.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=legend+of+zelda+ocarina+of+time+master+quest+shadow+temple+walkthroughPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18011 11508 bytes
SHA-256: 1fe145336c7a620de411c74be5caca1988970aa264864314076f0d2cb3da03e0
font_01_sfnt_off00019ab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19AB7 17896 bytes
SHA-256: 113918dd2bb5198945732c8a0e4082bda6449d814396442df7754455d2525048
font_02_sfnt_off0001c97f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C97F 8476 bytes
SHA-256: e3cdb99a297817bbdd654534f1910e14adfe82ea2d3e0931ee80359085094af5
font_03_sfnt_off0001e5c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E5C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1