Malicious PDF — malware analysis report

Static analysis result for SHA-256 540611939574e77d…

MALICIOUS

PDF

78.6 KB Created: 2021-09-03 23:24:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 687108263c52ea3ed0fee39393b56715 SHA-1: 06ec95e99396c1ff6da8f677042fd01fea254c3a SHA-256: 540611939574e77d65780e8edec5f658019277c32ad32bab07724addcb36f59d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this attack pattern. No scripts were extracted, but the primary function appears to be directing users to external, untrusted sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://pistant.ru/uplcv?utm_term=fine+woodworking+archive+pdf PDF link annotation
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/paki9ae0ahegg1u0u1u9lqn2s0/rifikifomigijilinetofozup.pdfIn PDF document text
    • https://boyanbolyarski.com/userfiles/file/ruwinevejid.pdfIn PDF document text
    • https://cape-electronics.com/media/file/jalapigovupasefuwewog.pdfIn PDF document text
    • https://dongcohonda.com/userfiles/file/roladesurogozozefa.pdfIn PDF document text
    • http://mylodge-naoshima.com/images/blog/file/95598470230.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/f490eb4cba26ffaac0f6b72e4a58a370/mofolenixa.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/51925597757.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/161187a7ec76b0---82422924081.pdfIn PDF document text
    • https://papiratisk.cz/soubory/vujelakezaxapa.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/razakaku.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce1a65e304---7605448297.pdfIn PDF document text
    • http://trustycctv.com/ckfinder/userfiles/files/78133203552.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e082b5b1f---92281282044.pdfIn PDF document text
    • http://yksskj.com/ckfinder/userfiles/files/dukopesekelunepunot.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16086c5987a6bf---74135952869.pdfIn PDF document text
    • https://terlickodds.cz/www/www/fckphotos/file/pabarejujawopaloga.pdfIn PDF document text
    • http://ski-experience-japan.com/images/blog//file/21071755636.pdfIn PDF document text
    • https://www.scmsgroup.org/ckfinder/userfiles/files/23533265827.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/7039599041.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/votab.pdfIn PDF document text
    • https://loffoxfitness.mvwebsolution.com/userfiles/files/xiwivutisamuguw.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/87196686813.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/pulobodopovezazojori.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/qd1h75m402abr08t3s616ddch6/ludibesasitake.pdfIn PDF document text
    • http://toshiteriyakiburien.com/uploads/files/dagasafad.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_off0000ccce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCCE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e4e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E0 17984 bytes
SHA-256: 2ecdce08ca692ce604d6b35866f9587466b942f008b6cc4a98684f33fc271455
font_02_sfnt_off000113e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113E7 10808 bytes
SHA-256: a7f9262595f7192245d3d5be602d9c3464ee2c4676241d76005967b1ff82874a

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