Malicious PDF — malware analysis report

Static analysis result for SHA-256 c85ae4491965f4df…

MALICIOUS

PDF

83.2 KB Created: 2021-09-06 14:59:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d0a1ac74279f95dbb473eb8eb7108412 SHA-1: fd160f1f622902df3f18568fa0a3280ffb9a92a3 SHA-256: c85ae4491965f4df546a82011c1ed841f61f6ab55fc3520fc21de5e9cf15b8d9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=simulation+of+manufacturing+and+material+handling+systems+pdf PDF link annotation
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160f74f165166d---30970815105.pdfIn PDF document text
    • http://patrick-vallot.com/upload/files/ninewewawunefiremeruwodu.pdfIn PDF document text
    • https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/hthtcpr91q5jfiqjvo60d2oi1e/kipusuxupajena.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/17426063338.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/ecjqke09dtps8lf9pdk75r9ran/rufolupepefefarogig.pdfIn PDF document text
    • http://pm-ural.com/uploads/files/milabumew.pdfIn PDF document text
    • https://vibangthuaphatlai.net/uploads/files/pumabepunilibiluveg.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/67569832695.pdfIn PDF document text
    • http://gtshotel.it/images/file/56647963508.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/xokuwewefu.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c3099594589---lixotefadukanibupofarakuj.pdfIn PDF document text
    • https://club-sports.net/uploads/products/files/mimopuw.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160bcc6cebc2b3---90061287752.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/potiwibisog.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/622b52ea32faa051fd6d6f8dafcf346e/95477681686.pdfIn PDF document text
    • https://onhimalayas.com/ckfinder/userfiles/files/68692472694.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080a0420adbd---duxojedidofapebakujovap.pdfIn PDF document text
    • http://mackyz7automotive.com/js/upload/files/favetawi.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/eaa2c9ae1575a93cd11b86caea16ff87/72584369241.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/5raknht909e2eg2hkmln02pt34/9342643546.pdfIn PDF document text
    • http://weberstellen.ch/userfiles/file/23097284284.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/1d9vh8be5556rf86g9g6tbd5h2/jipebugisike.pdfIn PDF document text
    • http://shangrilayunnan.com/ckfinder/userfiles/files/natedat.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e71b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE71B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2D 14892 bytes
SHA-256: d0122d3e158662108b207c7ef1251a8e03a68fa8d5d72b55207181785eaed5d0
font_02_sfnt_off000124bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124BD 11356 bytes
SHA-256: bf28c6ed8ec01c36566f6276e7d5753843253991df8736ee637908d38abcebf2

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