Malicious PDF — malware analysis report

Static analysis result for SHA-256 06a29ff4cddbd54f…

MALICIOUS

PDF

81.2 KB Created: 2021-09-06 21:48:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e6e1ab1f63c6d485b24b82e3c3f32ace SHA-1: 672d0d92faf6feef619964cb283763bdc49b0c70 SHA-256: 06a29ff4cddbd54f1c5d66c34426d60311fb9c96afd0fc26cbad18f630dc04bf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document identified as malicious by ML classifiers and ClamAV. It functions as a link farm, directing users to multiple external websites, many of which are hosted on compromised WordPress sites or disposable domains. The presence of numerous URLs, including those with UTM parameters, suggests an attempt to lure users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nomylo.ru/uplcv?utm_term=cara+memutar+gambar+dari+pdf PDF link annotation
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/mfa4df8obe27e7rl9us2thmvdk/vefuliko.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/81776127959.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160afd84e0942f---woxodivaf.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/jakixutepoti.pdfIn PDF document text
    • http://jumpinfit.it/userfiles/files/61007529141.pdfIn PDF document text
    • http://gutachterbewertung.de/userfiles/file/26804626598.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb43098811---1412180122.pdfIn PDF document text
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/tuvejefibuzupene.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a896869d4f8---baxokezupukikemeraxinefur.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099ffea70d77---razurefexutamekikol.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/fnt3esrh3t18q1ip9mpau75b44/kaxojosu.pdfIn PDF document text
    • http://allg-gyn.ch/userfiles/file/gibakimuledotozegaduki.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160aedf9c78f93---wukesufiwifunizowedofop.pdfIn PDF document text
    • http://megalaserasia.com/upload///93870461276.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/20277693136.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fda5fc1824---45628921056.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/vkdmoc7uhujipggr27l5tb2947/4141888228.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/a9e9e8a94853344b56e644cfc1015831/puxepalakete.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/60488058499.pdfIn PDF document text
    • http://sochi-riba.ru/ckfinder/userfiles/files/vidiviwuvudodezelagaw.pdfIn PDF document text
    • http://eastmoorclassof1970.com/clients/4/43/4343e427eb1b0a0668350338a4d6b623/File/dagumujab.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/p38sglri2qjb8n40vjocnoep49/dajamefusojojiwudavaxemik.pdfIn PDF document text
    • https://highendteen.com/userfiles/files/53453025535.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_off0000db69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB69 16636 bytes
SHA-256: bbae82d4ba7deb47a15559881fa8f10e5cecad44c9a928ca71cf87b6c0e80460
font_01_sfnt_off000106f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F3 10672 bytes
SHA-256: 26e79ca1c719ad8c67a59a678149c3865838eb74602f738a86c60ffd07e6263b
font_02_sfnt_off00011f06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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