Malicious PDF — malware analysis report

Static analysis result for SHA-256 498380e6ca7c8b8a…

MALICIOUS

PDF

103.7 KB Created: 2021-08-16 01:49:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a6d21b27d3adfbc24b4316ff873a7d86 SHA-1: dd7ebbd61e1ae816c8962a5f92a26ba889c1b0e4 SHA-256: 498380e6ca7c8b8a5ab18b1a48afa70e80b1eeeadf1880fcf012614ab27de868
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites and disposable domains, suggesting a phishing or malware distribution lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to exploiting PDF vulnerabilities or delivering a secondary payload via embedded JavaScript, although no specific script content was extracted.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://huntic.ru/uplcv?utm_term=lumen+ohm+answer+key PDF link annotation
    • http://odesignlab.ru/admin/ckfinder/userfiles/files/6123707612.pdfIn PDF document text
    • http://tasarimak.net/ckfinder/userfiles/files/30518421337.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/ndcdjrrf3ff6birmc5l0dgds83/98950514833.pdfIn PDF document text
    • http://flexa.cz/docs/file/gavedalu.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608d8ccc0d43f---23466861601.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/6df746593f660e905fffdcc788639204/70032846303.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160768cef36cca---41279372597.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610606d068de8---kolitakole.pdfIn PDF document text
    • http://prestopc.it/upload/file/37142771318.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/pekeku.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/42lsoj53h9sm030re0mcvponof/reduvoruzavorofujupira.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-7-12/20210712211704637252.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/kugebemedetixamuluxutigab.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160928194cdc98---29761136564.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a0226970303---18612166957.pdfIn PDF document text
    • http://sethhukumchandschool.com/userfiles/file/dopexijefovezimalemevuj.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/16083b129e24ea---79031833356.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/44656497304.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/vufj5o0dg3tokjeofp4pd0i3d2/23510077867.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/71601557493.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/kiwaruzivojumadezubezisir.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6ceb2f67c---68719171029.pdfIn PDF document text
    • http://www.chubsorn.com/file/files/fidujizekamigedanuveva.pdfIn PDF document text
    • http://ngocvietbungalow.com/upload/files/10236159390.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609537f1bd17d---88691496654.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_off000133e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133E8 10484 bytes
SHA-256: e9ed03c12dac5e52729bc7d265f9c5344c851727481c32c12b18a47ec29cccfb
font_01_sfnt_off00014b9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B9F 17236 bytes
SHA-256: 59eba2e8884e917d360883aec0e8b5ae64a439bb1d9110b8104d48696d7b08f7
font_02_sfnt_off000178e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x178E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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