Malicious PDF — malware analysis report

Static analysis result for SHA-256 260eb6f8b046fc74…

MALICIOUS

PDF

74.6 KB Created: 2021-10-10 01:05:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 569eb47e8d74a024691cc27ce11f8592 SHA-1: 212e7a29e085fcd1644d9a8c49c438ff24cf03b1 SHA-256: 260eb6f8b046fc74fe4633114f9df4f5c73d1ad4f5a39b960110cb0750c5139a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URI indicators and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further support this attack pattern. No scripts were extracted, but the overall structure and URL distribution indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://crysiq.ru/uplcv?utm_term=123+movies+knives+out PDF link annotation
    • https://menokatea.com/ckfinder/userfiles/files/gubizefavepan.pdfIn PDF document text
    • https://coevent.ru/upload/files/29968383260.pdfIn PDF document text
    • http://tiyuchangdi.com/upload_files/files/20210905_222009.pdfIn PDF document text
    • http://cravaluos.com/ckfinder/userfiles/files/95634357839.pdfIn PDF document text
    • http://dichvuhangngay.vn/uploads/image/files/98377435.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/90647674923.pdfIn PDF document text
    • http://studiosiriosrl.it/userfiles/files/75063025795.pdfIn PDF document text
    • http://porpora.group/imagenes/imagenes_contenidos///22600005593.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1614943336a15d---zaruxubumew.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615f72d283325---5256779917.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/83ed256d6e962a39b9d33cc968cbaa06/14213036698.pdfIn PDF document text
    • http://selidbe-beograd.info/files/70090865520.pdfIn PDF document text
    • http://pactolous.hu/upload/file/vaniwenifaranaba.pdfIn PDF document text
    • http://gz-chengeng.com/uploadfile/files/bebufukitixudifiw.pdfIn PDF document text
    • http://alexdisinfestazioni.com/userfiles/files/ginokiwibatorafu.pdfIn PDF document text
    • http://aj-freight.com/ckfinder/userfiles/files/peguxudupoje.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/jaxafo.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16140f03270944---najijopaf.pdfIn PDF document text
    • https://tempatpasang.com/contents/files/70201446005.pdfIn PDF document text
    • http://a1climbing.com/userfiles/files/jujegujovije.pdfIn PDF document text
    • http://techbis.pl/files/file/xogeralevod.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/92741778524.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c25a6af51b---79629972248.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_off0000be44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE44 10464 bytes
SHA-256: 487eb05cfbd3be4b14949fa5c0bfc524c8ba4d0ce000c7ccf6aaed3457be4541
font_01_sfnt_off0000d620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD620 18372 bytes
SHA-256: 499e3db07dff015e41a386227887453da549f4d1a7dea3c6250a861b5ecfedb3
font_02_sfnt_off00010627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10627 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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