Malicious PDF — malware analysis report

Static analysis result for SHA-256 df3585b67059a2f4…

MALICIOUS

PDF

72.8 KB Created: 2021-09-04 00:48:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7fbb13db98fd8c986632a39a3dc2cfbf SHA-1: f8caeaec667d300b83b17afe31103cf768151250 SHA-256: df3585b67059a2f4ba97e6a28ff9b1fe9c1a436246062199616a874213abf87c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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://smidgel.ru/uplcv?utm_term=data+munging+with+python+pdf PDF link annotation
    • http://iphysiology.ru/upload/48686445962.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c32d42120---2062002089.pdfIn PDF document text
    • http://bigandtallking.com/userfiles/file/levejalezezuzepat.pdfIn PDF document text
    • http://slp70.com/clients/873855/File/wusagiv.pdfIn PDF document text
    • http://elcivan.com/admin/UserFiles/file/26114608854.pdfIn PDF document text
    • http://medizator.ru/ckfinder/userfiles/files/5363256977.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/xosujo.pdfIn PDF document text
    • http://shukokai-voves.fr/userfiles/file/59607191831.pdfIn PDF document text
    • http://elitsatodorova.com/uploadfiles/file/kekeluguk.pdfIn PDF document text
    • https://mk-sito.it/uploads/file/96786337936.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/pitekejupogopiwabotevi.pdfIn PDF document text
    • http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/66660430256.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608180d25b3fa---zaxinu.pdfIn PDF document text
    • http://zerosquareonline.com/file/salibinigazuwa.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160995e8402f3a---37853140877.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098f40e4ee63---79966278128.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612102f3049a3---55927022578.pdfIn PDF document text
    • http://sieuthihatgiong.vn/webroot/img/files/68602023761.pdfIn PDF document text
    • https://pensionradvanice.cz/res/file/nagodibesiretewimuja.pdfIn PDF document text
    • http://helenhotel.vn/upload/files/85593480450.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16075f61b92850---kuxekugubetibiregototat.pdfIn PDF document text
    • http://balassalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/87207868690.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/dufola.pdfIn PDF document text
    • http://yanarfabrics.com/firma/files/19950814108.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d2708b94e43---87295302878.pdfIn PDF document text
    • https://ural-aiti.ru/admin/ckfinder/userfiles/files/68904102085.pdfIn PDF document text
    • http://alacarte-grafik.de/userfiles/file/66467439697.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_off0000bbd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBD6 10800 bytes
SHA-256: 0b3477ad4a34aa9f10f17f8404e822982d3075c253f44932a73cea56cac42dfc
font_01_sfnt_off0000d457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD457 15972 bytes
SHA-256: fa7539a118061071aa2e6e13d7f4b442e1342e45e9851ac07d11be7cfdcb6428
font_02_sfnt_off0000fd33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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