Malicious PDF — malware analysis report

Static analysis result for SHA-256 b136f6c52cf100a6…

MALICIOUS

PDF

81.8 KB Created: 2021-09-05 14:23:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2d8176ec6b4bb376159af4252b74c076 SHA-1: 99a7198cb27d6a8deb143d9d2802f1bb27f136c3 SHA-256: b136f6c52cf100a6df5c3bbbf8d020c5fd11e34325a5b4563d02c94f23f7e1cb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely responsible for initiating the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://kvizek.hu/ckfinder/userfiles/files/jivolidejuzenegetow.pdf In PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6a3599eae---latitozagorijebu.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/ae9db9a51fd473058d740a7936637030/87779674985.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/lobanigewe.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/62631287288.pdfIn PDF document text
    • http://kingsauto-bar.com/js/upload/files/mibekoxebun.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087a4ec4cfe7---58971725437.pdfIn PDF document text
    • http://otczenacts.com/media/files/kupirokabutavepuputow.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/xajawinonigufasewopakaga.pdfIn PDF document text
    • http://obrienbuilders.com/userfiles/file/vixipazabip.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/mekirijaresat.pdfIn PDF document text
    • https://spheresignal.com/app/webroot/userfiles/files/77898018783.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609695e55c95b---13144293039.pdfIn PDF document text
    • http://studiomontironi.eu/userfiles/files/womavokaxiniv.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/90318961511.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/6513359fd1fd2c19220871dcbc4a62c1/xuvuletuvopifor.pdfIn PDF document text
    • https://bodymart.in/ckfinder/userfiles/files/laninorulugirogukezodasuk.pdfIn PDF document text
    • https://highrise.pl/file/39208467821.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/asgnlj8uoq6q2n3tl67j87egpu/16723691251.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/c78b0e393465099274859a781dd7ede7/90735850678.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/7d35428a313604af0bdc1645099853ca/bebegiguno.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/33583259042.pdfIn PDF document text
    • http://denprokhorov.ru/images/file/domorisuwajiteg.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/62152506449.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=adhd+medications+canada+pdfPDF 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_off0000dbf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF9 10720 bytes
SHA-256: bc5242e1cbd8015b79ffca0d340abaa47cfdb62e20ae74a8c21b77cd03fcf099
font_01_sfnt_off0000f470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF470 17736 bytes
SHA-256: cc347aa40590eb223b05defc6c308bf65cebd3599f142c21a828d95fb334a2e8
font_02_sfnt_off000121eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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