Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb188564b1c7ca38…

MALICIOUS

PDF

106.1 KB Created: 2021-07-17 02:55:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 92c624e88772653e4ee077cb492160ff SHA-1: 3ee2f2e3fb7199d27c4596a7e67be3fee334e57c SHA-256: cb188564b1c7ca38549fec4ba64ec7a3c9b941a2c333616f389ec34809819cbb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised CMS upload directories. The document body is heavily obfuscated and unreadable, suggesting it's designed to obscure its malicious intent rather than convey information.

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 http://hoitruyengiaocodocvietnam.com/uploads/image/files/denepineteditu.pdf In PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e051f94e5bf---memaniverepumelepiru.pdfIn PDF document text
    • https://gastrotest.co/ckfinder/userfiles/files/58978850278.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/9cdd802648997b99dc40595dbaa80701/vafiko.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/2e69be33d3e76af26bee040d90fcdca7/taxozijinubino.pdfIn PDF document text
    • http://cloverdiamond.com/file/14009581480.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/bozenemajoxuk.pdfIn PDF document text
    • http://conflictfreeelectronics.com/ourprojects/chowki/UserFiles/renuka/file/43201062555.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607729fae54d5---lekusewewakarenuzadasuwev.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/difikiburodenirugefaviv.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4d93313731---musov.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/25609156826.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607199d0a475b---73247467881.pdfIn PDF document text
    • http://rubivina.com/Images_upload/files/69778194145.pdfIn PDF document text
    • http://weifong.tw/fckimages/file/fikodipipabosimopevusi.pdfIn PDF document text
    • http://abnicum.com/files/file/30101201387.pdfIn PDF document text
    • http://astorandblack.net/emailer/userfiles/file/94750941648.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/76497717180.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607cea4a82eb7---xusijukida.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/ltoog39sij6pb26k0o14u0bjq1/womako.pdfIn PDF document text
    • https://elitediesel.com.br/ckeditor/ckfinder/userfiles/files/mumuwase.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/a270d48e5602f70e08e1cf7990f92fae/11809178431.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=reflection+about+self+conceptPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013dab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DAB 18024 bytes
SHA-256: c044c32b4c413125515b26b58002530a41f601ebedd14f6279e5ec8494176f83
font_01_sfnt_off00016b84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B84 10660 bytes
SHA-256: 5237877b043b17cec49c55a2a13afccad9274cbaf79fdae9990ac9574cfb1d98
font_02_sfnt_off000183dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x183DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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