Malicious PDF — malware analysis report

Static analysis result for SHA-256 9927a293f1aff794…

MALICIOUS

PDF

82.5 KB Created: 2021-09-11 23:53:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 33ac285a2154682f3af86f3685815eac SHA-1: 98757b3345529443da8c21c987b20f64e823e784 SHA-256: 9927a293f1aff794953a51f97a827e5535c4870d4f9965c0cc8fd00db68349eb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it contains embedded JavaScript and functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. The embedded JavaScript likely facilitates the redirection or further payload delivery, contributing to the phishing or malware distribution objective.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.adom.biz.pl/ckfinder/userfiles/files/49111746670.pdf In PDF document text
    • http://grupopiscis.com/upload/files/sajed.pdfIn PDF document text
    • https://qigoodteam.com/uploads/files/202109060137446895.pdfIn PDF document text
    • http://calisnt.com/uploads/files/76559882405.pdfIn PDF document text
    • https://pataniforum.com/admin/jquery/ckfinder/userfiles/files/30665514761.pdfIn PDF document text
    • https://sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/27952850799.pdfIn PDF document text
    • http://morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161320f245430c---tufivivowalakuxebawuzule.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///purazolanejeme.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/17718935862.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16131d85fd40dd---78272513361.pdfIn PDF document text
    • http://pharmabiosolutions.com/filespath/files/20210912031727.pdfIn PDF document text
    • https://boyanbolyarski.com/userfiles/file/85222067216.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/wezegugulerorivexi.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/82226720794.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/p1eh538midi38sv1mo9909q6id/wezurozogikurive.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/84161251566.pdfIn PDF document text
    • https://habibitours.org/ckfinder/userfiles/files/wabiwabafusadopowuxawuxe.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/53765580958.pdfIn PDF document text
    • https://jmcoverseaspvtltd.com/uploads/files/zigapuvalu.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/3107311936.pdfIn PDF document text
    • http://brcassociati.com/userfiles/files/bokow.pdfIn PDF document text
    • http://prasongp.com/file_media/file_image/file/71914074957.pdfIn PDF document text
    • http://sivam.pl/files/file/porogot.pdfIn PDF document text
    • http://suspensionestg.mx/userfiles/file/96718061093.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/464ec62ac7ffb5ab919587636b54f076/jotoxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+transfer+downloads+to+sd+cardPDF 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_off0000dd21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD21 10452 bytes
SHA-256: 373e051202a2718c4758c00f7d499da1c6c61d0a074c2bb45227fb8837d269f5
font_01_sfnt_off0000f507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF507 18004 bytes
SHA-256: 018198fe437157bd4a4b5baa840e0cbf0306e47a8bb434b0de829f64bad77f25
font_02_sfnt_off000123c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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