Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d81f25e256cbc86…

MALICIOUS

PDF

90.0 KB Created: 2021-07-17 09:18:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cd5de3ed9aaf9af3aeae5388d0cae6d5 SHA-1: f90923e691a82c6de847211cf989b7ee62ff5c88 SHA-256: 7d81f25e256cbc86061dc704821e3b256fd4610a061242077e8ac87ca71c7277
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting, likely to lure users into clicking malicious links. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics strongly suggests this malicious intent.

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://mnwebdesign.dk/userfiles/file/77098142661.pdf
    • https://annekienlen.fr/imagesfile/23853309228.pdf
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/02d42662f208000d0af99ba92299f249/99450039473.pdf
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/c1d5c3a7f37f12027dd629d621b17613/pakuporupa.pdf
    • http://kapelski.pl/userfiles/file/lugeru.pdf
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/d1n7e78mdpvjm1ih9h783ift06/bareg.pdf
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b18607a8070---tixosurubekuzizosom.pdf
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160961ef8c03b0---42064090021.pdf
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607815c561e8b---40089044089.pdf
    • http://anvlaw.com/userfiles/file/61018806221.pdf
    • http://www.houstonorientalrug.com/ckfinder/userfiles/files/jadem.pdf
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a61a0122e3e---ropixuxedorelot.pdf
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c0828ac1cbc---pijogotameresezab.pdf
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/a85c29f44399fae01b532b7220c3b82c/44691548104.pdf
    • http://cancercareresearch.com/userfiles/file/88532505002.pdf
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/c561f3d522592fc62c66c84c44c25dea/vikawe.pdf
    • http://goldenpoolandsauna.com/user_img/files/xezaxoga.pdf
    • https://mysmartedu.com/uploadimages/files/menewosuja.pdf
    • http://terezmisszio.eu/files/file/fewezaxojaxizekafufir.pdf
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/0d3508f412235a437fae2285f841df42/lipavigogobajolag.pdf
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/eqkg7v7a5sheb697v1jv033eu7/79532039677.pdf
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160abc2edd7741---77548778436.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=trivial+mitral+valve+insufficiency
    • 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_off0000fe0f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE0F 16792 bytes
font_01_sfnt_off00011621.bin
078f11d406017479123d364f289d19c97b158a91ec00508e0942b5b83abb035d
pdf-font-stream PDF embedded font (sfnt) at offset 0x11621 17148 bytes
font_02_sfnt_off00014285.bin
677b050a9bf3b02a62428c48640166b44273653d9fcc4ed9f5ca8918e7f7c281
pdf-font-stream PDF embedded font (sfnt) at offset 0x14285 10620 bytes