Malicious PDF — malware analysis report

Static analysis result for SHA-256 c93c98245b31fac2…

MALICIOUS

PDF

88.6 KB Created: 2021-09-13 10:22:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f9d2c1e8d582cc2aa09262cf8d2a5dd6 SHA-1: 79acce832d6f202d850f726d325e5ffe6d09108c SHA-256: c93c98245b31fac232b7a8693912f882b197810b1a6436ea368b4d56244c6d96
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the nature of the document as a deceptive link collection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=english+russian+dictionary+for+android PDF link annotation
    • http://sahrugs.com/userfiles/file/wobiradofef.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/fejevibutomikemopazu.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fed1814979---kagepakubofisivibuvaj.pdfIn PDF document text
    • http://xn--knstlerische-biografie-arbeit-lbd.ch/userfiles/files/tolutar.pdfIn PDF document text
    • http://yourmoneyyourbank.com/uploads/File/zajotejotunubep.pdfIn PDF document text
    • http://ksiclubbiz.ksiclub.org/svnprojects/DHD/Source/images/files/waxem.pdfIn PDF document text
    • http://micruts.org/userfiles/file/fimamogobu.pdfIn PDF document text
    • http://artin-intranet.com/ckupload/files/14185687344.pdfIn PDF document text
    • http://61kidsclub.com/userfiles/file/494345603.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-7/20210907002117428020.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16130c9a047e18---60609901455.pdfIn PDF document text
    • https://chandrakantmusicacademy.org/ckfinder/userfiles/files/98863923630.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/9869883488.pdfIn PDF document text
    • https://angelsolutions.ro/ckeditor/ckfinder/userfiles/files/koroxupeminudezuxoke.pdfIn PDF document text
    • http://caogenzhiben.com/filespath/files/20210906074930.pdfIn PDF document text
    • https://servauto.fr/img/user/file/genodozenow.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/wifadexosajosemuw.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e5f7e07e1---31157635192.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130c48500317---21231728594.pdfIn PDF document text
    • http://sitarofindiamd.com/userfiles/file/59452311836.pdfIn PDF document text
    • http://greatwalledmond.com/ckfinder/userfiles/files/16216819574.pdfIn PDF document text
    • https://rodolphe-blanchet.fr/Rodolphe/fckeditor/file/49194351901.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/4183091592.pdfIn PDF document text
    • https://vadihosting.com/calisma2/files/uploads/29059844334.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0001078c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1078C 18124 bytes
SHA-256: fa0a80d764bbc33d471ea9cae1bfa978ecb436af66e96ca322553129d00c0448
font_00_sfnt_off0000d6c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDE 10820 bytes
SHA-256: 598e1f119ea0763f49a18a8fd98423544692c3b6f10f349659ed22327a6c1119
font_03_sfnt_off00012458.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12458 17840 bytes
SHA-256: 5e07df26755acdedbf0bc0219dbedbffa514022e5860e0ae9f32bdd1d2a1437d

Open this report in the interactive analyzer, or submit your own file for analysis.