Malicious PDF — malware analysis report

Static analysis result for SHA-256 16c383e54ece4c90…

MALICIOUS

PDF

85.9 KB Created: 2021-09-07 05:25:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c0958063bb01c672166f932e275c066f SHA-1: 1fafd16e67f3811280264f41ca2c921cb0280c61 SHA-256: 16c383e54ece4c906e8ef1396f3a27d6256fa203c79ce7cf53741b7dfa42d6cb
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and other domains, suggesting it's used for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the embedded URLs are the primary indicators of its malicious function.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://queure.ru/uplcv?utm_term=diverticulitis+guidelines+pdf PDF link annotation
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161219ef1a1f1f---56657133670.pdfIn PDF document text
    • http://fueandhair.com/userfiles/files/12419817031.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607c10ebbf436---dulosigoxomolek.pdfIn PDF document text
    • http://abnicum.com/files/file/pavaziwuzodiru.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c941e29ed1---88775396834.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/92904886401.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/gumakogemigomewigufineja.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0cfd93cfa0---xuwexapovumakixof.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/linivufusowiwidijeriwoso.pdfIn PDF document text
    • http://chukgoobok.com/files/fckeditor/file/mojasuvobipamugo.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/58465738913.pdfIn PDF document text
    • https://aventura-agence.lu/userfiles/files/sutozupogaxinosana.pdfIn PDF document text
    • http://hotelniagararimini.eu/userfiles/files/bifiliridomijele.pdfIn PDF document text
    • http://mikllc.mn/uploads/files/93279200943.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/tovoranemosivuka.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/pogiluvipufoke.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/rorixos.pdfIn PDF document text
    • http://xn--80aamdqpfpr.xn--p1ai/upload_picture/58184641511.pdfIn PDF document text
    • https://gonguyenkhoi.vn/upload/files/13360220743.pdfIn PDF document text
    • http://minuspk.ru/minuspk.ru/userfiles/file/18997087024.pdfIn PDF document text
    • http://jhdjt.com/images/upload/File/tuwafokilaropix.pdfIn PDF document text
    • http://bptramptour.pl/files/file/6043948355.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/cfc2964f3f24535381afd2d6a8e89fd9/5335194842.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/60946223441.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/b192dac1551d3fc10c33475f9819d159/mulunujepupobe.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_off0000ea2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA2A 10680 bytes
SHA-256: 63d01763991e92a1bfc088314d322f0d30935761cdf2df489bf9959d02929924
font_01_sfnt_off0001029d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1029D 18416 bytes
SHA-256: 693a0594cd914dbcd6c21e0d15d6cad3464af1a311eca0d07c51effb160e1b10
font_02_sfnt_off000131df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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