Malicious PDF — malware analysis report

Static analysis result for SHA-256 893d021be9c17de6…

MALICIOUS

PDF

80.0 KB Created: 2021-09-04 19:29:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2c8a0eb0b3e25dcd9aca77347b5136d4 SHA-1: ed92aeb51c1cb3713c3aeb0f689cd34ea6dd66c2 SHA-256: 893d021be9c17de63f9b415f7cc6e7b69967ec8873bdbd29ff8b33eebc7f8281
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with many embedded URLs pointing to potentially compromised or disposable hosting. These links likely serve as lures for phishing or to distribute further malware, aligning with common tactics for initial compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://krisoc.ru/uplcv?utm_term=cheap+manual+cars+for+sale+auckland PDF link annotation
    • http://uniquehotelsolutions.com/files/others/6435610567.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/furakoviboxodepumiz.pdfIn PDF document text
    • http://droneducational.com/admin/userfiles/file/gizawuzuwomumesusarej.pdfIn PDF document text
    • https://nhahangbienhaitien.com/uploads/files/88952792798.pdfIn PDF document text
    • http://studiostocchi.eu/userfiles/files/40358736002.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd16073a71---zunuzisokuzidaterelixa.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/xoxopologosonod.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16080d520778c9---korumiziguv.pdfIn PDF document text
    • http://artospace.com/pics/file/rixul.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/goduvojawelexi.pdfIn PDF document text
    • http://k-yoga.org/file_upload/spaw_upload/file/20210621174956.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/jodovigelopejuro.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611f79ac10e3d---vorutekebut.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/guxesebotubosasidamo.pdfIn PDF document text
    • http://gojjang.com/uploads/files/29868291736.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/af79b8c5f481a75898d36783df8b57ad/tatuzibogapadebaponi.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd3b51ba9a---11696223795.pdfIn PDF document text
    • http://burnettefamilyreunion2021.com/clients/867108/File/14088459490.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/14162871428.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e2a71100168---53907440574.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3df27ea39---11002777709.pdfIn PDF document text
    • http://mgtuae.com/uploads/file/xesideduzanediruk.pdfIn PDF document text
    • https://agmatbaa.com/upload/files/getewenumanorure.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1608aae9e8ccef---jijolipavelodikunuve.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/64649350755.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160761699defd2---82837607783.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_off0000d20a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD20A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA21 10920 bytes
SHA-256: fed8cbd29933092faa76cd40e06f3a7546e8c692780942aa0331fa4ddd219ab6
font_02_sfnt_off00010337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10337 17760 bytes
SHA-256: fe9f8ba7de3446924d55bedd9f6fb4f457d3e2caeb300e5c0c84d3cfbd7bea46

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