Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5d93701b68e2ccc…

MALICIOUS

PDF

73.7 KB Created: 2021-09-04 14:15:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8ee94aa98db73c6172261252a061f106 SHA-1: e7908801b1219c19b651fdc99be7a273ae47e5bb SHA-256: c5d93701b68e2ccc5e76aa207891bcef81cf9434eda08a8f8552274a28547341
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://dienlanhlongan.com/upload/files/14424558414.pdf In PDF document text
    • http://burfel.ru/upfiles/files/30032309633.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c36b3237878---56280619893.pdfIn PDF document text
    • https://jobtiara.com/files/files/61055102178.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dcb0b0722f3---52764972725.pdfIn PDF document text
    • http://showdoimovel.com/files/files/kabibilagi.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/ttd1vsc3f4l5n91lh5d770dg77/besurijifo.pdfIn PDF document text
    • http://dienlanhlongan.com/upload/files/98280347333.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/muduvizaxisevowesumi.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/gelaxufabofukuxi.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/3ea795fd284534441caaae18d46b88a1/wisufafikerofemubixila.pdfIn PDF document text
    • https://alcoquimicos.com/ckfinder/userfiles/files/37516328574.pdfIn PDF document text
    • http://seattleteriyaki3.com/uploads/files/49414083638.pdfIn PDF document text
    • http://ssp.by/var/upload/28444626130.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/fuzavoka.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/9fnrcojqmmdlrpuk29q7krb3g2/sixejapobomixivu.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/2d14f4d9e3ac6218125f90d86df021f9/kodufoparaxalajoludonedu.pdfIn PDF document text
    • http://turbotechnik24.de/userfiles/file/26980040092.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609831076dc76---fezubo.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df774e73e42---dibadazekugenutatizazod.pdfIn PDF document text
    • http://apcmagon.com/userfiles/resozanurufojilejebe.pdfIn PDF document text
    • http://tasteofruraleurope.eu/upload/File/96639672256.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/kotexev.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/92bebc2a086905b5fd356533bee7f1a2/11356651864.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a72fb178fb6---bavasuz.pdfIn PDF document text
    • https://giorgiosantinelli.it/file/33806771450.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=negative+prefixes+exercises+worksheets+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_off0000bbf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD402 16576 bytes
SHA-256: 5e49581936c0b1fc1e5cee467b0122a288e46e6d7f4b37a3f305dc56571ba397
font_02_sfnt_off0000fef6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF6 11072 bytes
SHA-256: 210e40e260046c260d3f3263a8a3be8c5cb7ff767de57efd3a48141017910347

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