Malicious PDF — malware analysis report

Static analysis result for SHA-256 3998bafad66e1155…

MALICIOUS

PDF

164.7 KB Created: 2021-09-02 00:36:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e86f531ecd108ac66e5c1401ca5217b8 SHA-1: 2990b143b104a7419ee9316f89786c05001cd9d2 SHA-256: 3998bafad66e1155c14515264aedcf4ad0485e4e8adfdf0759b005984e2c94cf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. Heuristics indicate this is a link farm designed to direct users to external content, consistent with phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://ketchas.ru/uplcv?utm_term=south+park+game+grumps PDF link annotation
    • http://golden-candies.ru/webroot/files/files/pajaj.pdfIn PDF document text
    • http://www.pataniforum.com/admin/jquery/ckfinder/userfiles/files/84618280319.pdfIn PDF document text
    • http://polesprogettazioni.com/userfiles/files/mibakelulubija.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/72779836786.pdfIn PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/5489696dac3c583e5f89838b250d310c/89635919030.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fdeaf49c5e---ruwibixatokazetepegitilab.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cc944c87b---14129489162.pdfIn PDF document text
    • https://schmitz.cz/res/file/gugeja.pdfIn PDF document text
    • http://ttmm.co.jp/ckfinder/userfiles/files/90024774467.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/jufaka.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ae9d3df93---garurutana.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c5152bdb28a---pavajorerixabubiwepawif.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/7c1b41aabb7500e3b095b14d2c796cda/33661448656.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612701db5ba44---rinarebema.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/42507980938.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160812e4cee0e0---59174550660.pdfIn PDF document text
    • http://sriagasthiyarastro.com/FCKeditor/userfiles/file/mofiwuli.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/dec2b2f333c31a3e04ed81df730fedb4/96836963409.pdfIn PDF document text
    • https://ssvacancy.com/ckfinder/userfiles/files/jetivonozuv.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/23d9b5a896e0d84bd5250b64d5780b1c/34721503347.pdfIn PDF document text
    • http://eventclub.pl/userfiles/file/vurofizugedu.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/80902490076.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_off00021d5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21D5E 10724 bytes
SHA-256: f344790c28f9ba395a6b002a19026afef3ddce32b98ea24a73b38cd31ec66567
font_01_sfnt_off00023613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23613 20776 bytes
SHA-256: 20ac4e0288696ae2854217d7ffbf4036b62ccf35888969996314931ec8048c82
font_02_sfnt_off00026cd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26CD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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