Malicious PDF — malware analysis report

Static analysis result for SHA-256 74cf3b19da96380b…

MALICIOUS

PDF

85.5 KB Created: 2021-10-05 03:20:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0755d2f70739bb76d0b120578738ecf9 SHA-1: 7a87c5c350b210eef5aa4484af7cab9d300ae0c0 SHA-256: 74cf3b19da96380b3099a94ae3eed31adee78d126bdb7796ce181137200e9ac4
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate the presence of a link farm, with many URLs pointing to potentially compromised or disposable hosting sites, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, lacking clear user-facing text but containing embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://rosanaalvarracin.com/userfiles/file/magowosiba.pdf
    • https://matagujrischool.com/admin/imagetemp1/file/dutimedoxejiwuvokubef.pdf
    • https://o2opr.co/userfiles/files/putebow.pdf
    • https://vasutaszeneiskola.hu/ckfinder/userfiles/files/23201341850.pdf
    • https://basundharamart.com/userfiles/file/sipaxagonibeleduneruxalu.pdf
    • http://marienoellebermond.com/img/uploaded/file/77996475124.pdf
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16150e21a35278---75504952996.pdf
    • http://hotelpenza58.ru/ckfinder/userfiles/files/zekanezinodor.pdf
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16145445e83499---55751023072.pdf
    • http://thicongdiennuocmiennam.com/uploads/files/9939132309.pdf
    • https://5of7edwardstreet.com/assets/media/files/37664243917.pdf
    • http://khiensa.com/UserFiles/File/51741891575.pdf
    • http://xn--80aadcnaeutgftohcogh8i8dsc.xn--p1ai/pict/file/tiratateripakelavumupexip.pdf
    • http://gro-felix.si/uploads/15205854092.pdf
    • https://sieuthimaycafe.vn/uploads/file/danafekesik.pdf
    • http://fitviewer.biz/files/file/66923987741.pdf
    • http://umrllc.com/userfiles/files/lijuvedifewifi.pdf
    • http://aarogyamedico.com/userfiles/file/mumipoloxunewebinopoxekeg.pdf
    • http://jinsonmetal.com/Upload/file/29061355511.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614eb89f17fae---18028754698.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=eukaryotic+cell+vs+prokaryotic+cell+difference
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5d5.bin
6ad71cf0dfac5a6cef101562d143654660dd607e0e7d341b8b8eb9748d7db76a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D5 10968 bytes
font_01_sfnt_off0000ff80.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF80 16792 bytes
font_02_sfnt_off00011792.bin
9cd93211b841eeda93b28f91fa6fecf74e55cbdb37eb859e1c6cdc4a64b50764		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11792 19124 bytes

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