Malicious PDF — malware analysis report

Static analysis result for SHA-256 36b90da60c671fe7…

MALICIOUS

PDF

78.0 KB Created: 2021-09-01 17:04:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 024a06974ff787718503d5abc179411a SHA-1: fcad6a53ebca6b8f1c973f9d0303e19a88f9670a SHA-256: 36b90da60c671fe7a09faa4747f41f496107558b4f9cbe5aeda113b518e1a416
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It functions as a link farm, containing numerous URLs that point to compromised websites and disposable hosting. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://cructi.ru/uplcv?utm_term=kenwood+ts+520s+service+manual PDF link annotation
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/waxiribefedidazaruj.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/4cdc0c976d806019b565d48877773c16/1562426693.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160878186ae83e---nalonaguzomemegolabunel.pdfIn PDF document text
    • http://asu78.ru/userfiles/file/wigidakogiwilaj.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/wujer.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/pa3o0gnia77902mj4649dnf7s6/30453588802.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608abf725919e---nawila.pdfIn PDF document text
    • http://bantinnhadat.com/users/files/32479802184.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/dgss8fi25f642m8f9rhq06olrb/95892183283.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606d24c515438---78885675647.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/f9c4322dd4204c18abb37e73cce17c2e/xituzuzikufome.pdfIn PDF document text
    • https://medtek.vn/storage/file/26566259294.pdfIn PDF document text
    • http://ctnphrae.com/ckfinder/userfiles/files/57236770546.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab2e027cf2---94849389841.pdfIn PDF document text
    • http://drivingtesttips.ie/fckeditor/userfiles/file/32350732277.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/temab.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/raor7v6dbm8gmp1bucg7sdfu13/21857145017.pdfIn PDF document text
    • https://topupdana.com/contents//files/zibazapaxutulunetetukaju.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/42796311449.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1bbd04a0d8---33422687595.pdfIn PDF document text
    • http://seashoresilverlabradors.com/clients/4/48/482fd9669fb3260065120a60ccac5e48/File/4615385313.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0576b58e5f---mipam.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b2ca64bb6d0---96829032947.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_off0000cb5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB5E 17148 bytes
SHA-256: 46b1241a948ccfcc49d22239ed2f1e5e82fa5475de61386da6363a16894c4c16
font_01_sfnt_off0000f823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF823 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001103a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1103A 11148 bytes
SHA-256: 544a61ed4e407dafd8d9452639972ef0e7164a12a6edf93e5163d6b6ed219bb9

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