Malicious PDF — malware analysis report

Static analysis result for SHA-256 84a2b0b6f20765e7…

MALICIOUS

PDF

81.6 KB Created: 2021-09-01 22:51:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fe775e558d20f3a7a637df6863dc9d05 SHA-1: 753bb76cbbf13cba1218902ab060d4f8bbfff343 SHA-256: 84a2b0b6f20765e76463c8d5a04260d12b8725732734056b6b5175950f8a1c9d
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's likely a phishing or malware distribution lure. The document functions as a link farm, containing numerous URLs that point to other PDF files hosted on compromised websites, suggesting a multi-stage attack. The presence of multiple distinct hosts and the use of 'utm_term' parameters in some URLs further support the phishing or spam campaign hypothesis.

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://philabc.ru/uplcv?utm_term=kate+and+eugenie PDF link annotation
    • https://bunyaminerdemir.com/resimler/files/bukuxakerapo.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b320acd3953---53632557343.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16104c76a7a9bc---mumuxokapejexodegakuj.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607f42eb95618---23680885751.pdfIn PDF document text
    • http://519pf.com/userfiles/files/rebenubodizaferexokadal.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160837eea23d12---49202972293.pdfIn PDF document text
    • http://nenorm.com/files/files/59759582497.pdfIn PDF document text
    • http://camberwelltaxi.com/survey/userfiles/files/66061235728.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/39981493947.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/fejexuma.pdfIn PDF document text
    • http://fletcherfamilyreunion.org/clients/52745/File/suxumulige.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/a41539b7a45234e1f998fcecd38f914d/tepurofusifoxegek.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/qjg5dr1r35fg6iaann1ksgkhq2/7557739549.pdfIn PDF document text
    • http://geteffective.biz/uploadfiles/file/33972818974.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/9a3cb5dcfcb52c202eaf7183d6da96bc/juxugilivutukavikazezafis.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/75787753778.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16094be09d58bd---durifaxatozejapanakemu.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/81738801195.pdfIn PDF document text
    • https://hitpoint.tw/userfiles/file/darowi.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/79378748340.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/64d32a6b52ef5491f9e453b2f2bd0dbf/gukobopimadaxetodiborugup.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/2flk0k0dm3erkabs6ib4qrh4i4/9861641213.pdfIn PDF document text
    • http://beming.com/ressource/site-image/files/56833824365.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/buvadorasomaxugabide.pdfIn PDF document text
    • http://abwpetersburg.com/uploads/files/gutuvomakixiwobapazup.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_off0000dc0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC0F 10080 bytes
SHA-256: 95824e25557129f5a8bf2936d253cea00fdc3f73608a3c7d73afe03ac1e86cd9
font_01_sfnt_off0000f25e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25E 18064 bytes
SHA-256: 7b767edbe374ee7c3fda24e1a8cfe19938f37a1fa19a6d60f6681a448095a394
font_02_sfnt_off00012112.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12112 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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