Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f8d1efc70cbd474…

MALICIOUS

PDF

85.7 KB Created: 2021-07-17 08:20:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 235a64f9c20bb6188fe7aa3015195dfe SHA-1: fce0aeb4c14293fb185f360d25cb7295837c605a SHA-256: 8f8d1efc70cbd474e1f2c138241efc269292cd42c45940ff041ea68370d9e87b
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to lure users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic confirm the nature of the document as a deceptive link aggregator.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/5820c923b20d27aeb38daf368b41cc55/63020527946.pdf In PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607233d47f7e7---nutenujujuferagexowe.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/a78aedbb5ab266d9f33b610c7aa3f142/65413501057.pdfIn PDF document text
    • https://www.channeloflove.com/ckfinder/userfiles/files/59083711837.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc075df125---lovofotopunubakufuxugu.pdfIn PDF document text
    • http://year-c.com/upload_fck/file/2021-7-14/20210714110547978386.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/jogupawerowokuba.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/b1d856345ea21ca96539b03e8cec03cc/nuxododekatoni.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/butalozefine.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a752da08926---febubokokuwijenesuxopa.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/3kal90fh973vv8bkoskg3ltj00/xusetixodosagusime.pdfIn PDF document text
    • https://roc.mn/uploads/files/laxuxuzanetavefilup.pdfIn PDF document text
    • https://residenciasanamaro.es/userfiles/files/vozegawoxobabasi.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/dizajetafetitubilozugewe.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a260ea274e1---21990592357.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/nejirozuvagi.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160aad84a0742a---54074128661.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/vimiwaroxedewirinikit.pdfIn PDF document text
    • https://www.deuba.info/wp-content/plugins/super-forms/uploads/php/files/jmjv5na9bjoe8mqk84q5vjo5jr/zumujezexikofi.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/toliriw.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/910t6kl9mcp4nqrs9n2lbdgkm8/68975554146.pdfIn PDF document text
    • http://cdn.eagle.mn/uploads/userfiles/files/91940026031.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/khct8vchgnacjvqmohhc8jqbts/jomufebol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=what+do+we+call+the+person+conducting+in+musicPDF 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_off0000ea6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6B 17368 bytes
SHA-256: 7d81f7bfc01fac42acd1aec3eddc03760bb90554341fdae72252bcee35032475
font_01_sfnt_off00011793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11793 11140 bytes
SHA-256: 887fe6722f32aa02e25b9b0d4859c4a714a4b6325a3afe7c6c7163a169fea363
font_02_sfnt_off00013137.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13137 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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