Malicious PDF — malware analysis report

Static analysis result for SHA-256 81f299053e25620c…

MALICIOUS

PDF

86.5 KB Created: 2021-06-29 13:42:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 788715e254cf2cd7f9282bfa4bb25add SHA-1: 85307643da01c090f645596505d80103af569ccc SHA-256: 81f299053e25620cb9d26f38f5a58839b11319b9713acf47df4e2fe133b98361
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress sites and other disposable hosting, suggesting an attempt to distribute malware or conduct phishing. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/141d42ec764e3e78f71afbc8ee1ec6ee/73776559602.pdf In PDF document text
    • http://www.darvidproperty.com/news/file/13226365695.pdfIn PDF document text
    • http://erdivigado.hu/userkepek/file/vibijexajuxa.pdfIn PDF document text
    • http://lafayetteconnections.com/clients/52818/File/tuwovuvagizeni.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/j140ja2qhtmmrrmbfnalgqe9kp/79129874740.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1c17816d1---48655933753.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/01ghget5m2lmgkeptv32ecfi6c/famotagebewiza.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/busanatetekibimu.pdfIn PDF document text
    • http://hevolta.com/upload/file/mamugaruwatorula.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/5pipg49gcvf5f2s4aisv6rnpv9/75341608408.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210628_2FA6C6A8397BF0CF.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/kuzifofodogufukaduvodana.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ea3203270---44439227861.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf44d5d2087---94932642806.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/belutuxojuputol.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091ced9e7a86---jigubokev.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/degenowabukas.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f9a3dff04---lejilurafokulefot.pdfIn PDF document text
    • https://keluargamimpi2.com/contents//files/muvevivubizoxe.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/70435388593.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cabb93fc6f---kexeranovupa.pdfIn PDF document text
    • http://datavincity.com/uploads/ckfinder/files/94986357122.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085408d9928b---bozexafojowefagelug.pdfIn PDF document text
    • http://tms-technology.com/ckfinder/userfiles/files/61559396692.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3855f627f1---zugunolaxojodekek.pdfIn PDF document text
    • http://utopiasacramento.org/clients/0/07/071cdeedc048305be324eb10ab8031d4/File/15566425838.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=from+earth+to+uranusPDF 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_off0000ef5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5A 10312 bytes
SHA-256: 81ad07aec034f9b56b4601569b807fca36aa1d58a92f3962d82eaf8328674c56
font_01_sfnt_off0001066c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1066C 17492 bytes
SHA-256: 1780470825fed62c3632c29ce42ce4119becc93e671e9e90567b81cc546fbc75
font_02_sfnt_off00013478.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13478 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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