Malicious PDF — malware analysis report

Static analysis result for SHA-256 9671dcd1d1b52235…

MALICIOUS

PDF

82.0 KB Created: 2021-09-02 20:01:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7ecc5a600f9ddcf1fb9af3c5d12ebf0f SHA-1: 464fc60ebab76be21ffe0047c40c720fb167b4d7 SHA-256: 9671dcd1d1b522356c6085e6d9df5ba03c6fcf588b1fd6039183dbbe56aaf986
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution campaign. The document body is heavily obfuscated and unreadable, but the presence of embedded URLs and the overall heuristic profile indicate an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://wastran.ru/uplcv?utm_term=bobinadora+manual+antigua PDF link annotation
    • http://hoteldarim.ir/basefile/hoteldarimir/files/rifaletadalilelexubav.pdfIn PDF document text
    • https://www.renfrewareahealthvillage.ca/ckfinder/userfiles/files/84321542548.pdfIn PDF document text
    • http://enjoyisagenix.com/ckfinder/userfiles/files/8768031507.pdfIn PDF document text
    • http://ladispensadicampagna.it/uploads/assets/file/1130363510.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16088dffcf1088---17509433760.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b1d48545d8f---lotapemeratopasok.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e86038d86cf---setobefopanopivujef.pdfIn PDF document text
    • http://www.tekkoo.net/images/library/File/14378489126.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9c925f21a---33332264768.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210626073206763.pdfIn PDF document text
    • https://sowlindia.com/userfiles/file/17810298307.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/77345915124.pdfIn PDF document text
    • https://metnar.pl/web/uploads/files/37316562702.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5839d5591---vewojavuremezikonawuk.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160758115d2887---77246563713.pdfIn PDF document text
    • https://sicurezzaips.it/uploads/file/27885637499.pdfIn PDF document text
    • https://tnmkor.com/FileData/ckfinder/files/20210829_01B18F914F6E1842.pdfIn PDF document text
    • https://koffiewarenhuis.nl/app/webroot/files/userfiles/files/41586132239.pdfIn PDF document text
    • https://study4student.com/cache/fck_files/file/82923174254.pdfIn PDF document text
    • https://zlataraburmevuckovic.com//files/xemubifiriki.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/28206005813.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//10763285431.pdfIn PDF document text
    • http://nonstopsushi.com/uploads/files/22899965852.pdfIn PDF document text
    • http://fgosvo.ru/files/files/71947414966.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_off0000dbb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB9 10584 bytes
SHA-256: 5977bcb1083365226278d03ad6b083bf9e268c00b851a592bd8cf76fba3b257d
font_01_sfnt_off0000f395.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF395 18068 bytes
SHA-256: 1bf0cbaf07f7b1d6064e02f0035e0b9117300d90cec984a617ebfeb72dad5690
font_02_sfnt_off000122d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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