Malicious PDF — malware analysis report

Static analysis result for SHA-256 f660bb60ec09848c…

MALICIOUS

PDF

87.4 KB Created: 2021-07-17 12:22:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 00d0c108ad597a8ed1c7707f81dfd48c SHA-1: b719bac897c94cc9187a35dce0e2e4c6538b1902 SHA-256: f660bb60ec09848c7587b93da2d88533f63fb026dd1a08ba6e55dcf63ee3aec7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple potentially compromised or disposable domains, suggesting a phishing or SEO manipulation tactic. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of techniques used to redirect users to malicious sites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://automotiveenergy.cz/userfiles/file/vujisuwitunipoj.pdf In PDF document text
    • http://americanewbie.com/userfiles/file/vizemituwuzamogasinujibe.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/06-09-05-29-36-91.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/fojuninawawegitexasap.pdfIn PDF document text
    • http://cuhs1981.com/clients/8/82/82ca37c076ec4232796cb58ed009bb3a/File/71143749172.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608468c1deadc---molimebijaran.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/19731667296094187894ef5.pdfIn PDF document text
    • http://daedukgs.com/admin/fckeditor/data/file/20210710191404.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609411cdee422---76760444557.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c25b1d729a---wimepojupipeg.pdfIn PDF document text
    • https://rcvizovice.cz/ckfinder/userfiles/files/gilitazasobetu.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/bilamabadawakukiralex.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/17251313987.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/6913283793.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075a79580574---41791448479.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/92a03d1c95647daa30f3953c0a80ec05/fujowumerabumumat.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/dlmk3ojlregs9467mbqqknb2m3/32196562244.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/8738291872.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/wefuzenadibalidowivor.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a2dfaadb9---15240077232.pdfIn PDF document text
    • http://inimtrento.it/userfiles/files/4078418604.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/17b75cc5fffcfa383dc3b6d2dad341a5/zuzefujakesabagewepafog.pdfIn PDF document text
    • https://fobh.net/userfiles/files/56499203474.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/fupogavawoduvawiguserev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=what+is+the+gcf+of+12+and+3PDF link annotation
    • 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_off0000f10f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10F 17460 bytes
SHA-256: b5f95d6c0b9cd1e71f8c7e0459f5c5884d30cee6ffc9dd09a246720d9d283ec2
font_01_sfnt_off00011ef9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF9 10948 bytes
SHA-256: 042e60097d4cb83f7597d370f67629a430c383065208b25da2b5e6ca57207371
font_02_sfnt_off00013843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13843 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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