Malicious PDF — malware analysis report

Static analysis result for SHA-256 a665cf79ea19bece…

MALICIOUS

PDF

92.9 KB Created: 2021-06-30 01:46:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 17d22ae868aa6aefd6b2506a3748b1ae SHA-1: 33b25b5b35264136c82158375e9f2429897c5ca0 SHA-256: a665cf79ea19becedcf5a9d273afe9f1284bedcb2c49c043233dae224a1560c5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16091061e4c019---fulasidorodogajiwaruwifor.pdf In PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/3gt49vg7jlds4d6pmeojvffhks/midinetewokefisowibugeta.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/853e4da5443ada2c4fcc11b0707d3c2d/7228863724.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/2422450a24a0ce70f71401723b46e3f0/rujitibuzo.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/tepimapes.pdfIn PDF document text
    • http://amsasecretariat.fr/userfiles/file/21076669863.pdfIn PDF document text
    • http://hrudolf.com/userfiles/99495332072.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/4a10d6944e9d1f50ffaa7f3c7cb22b28/29301628774.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ba9d6a64ce3---91308309179.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/fipizetobe.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d53a963621---vosawuloxijagog.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/88411421904.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/133c8b1bc4f563ee429e652e6597caf5/dokemedeguputi.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092fe4a0d76f---jefezifed.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d37a40a50---53155083860.pdfIn PDF document text
    • https://circolodelpistone.ch/userfiles/file/retorima.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160886bc73bb3f---59824723585.pdfIn PDF document text
    • https://rodolphe-blanchet.fr/Rodolphe/fckeditor/file/25667972522.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a5edabca788---87437529583.pdfIn PDF document text
    • https://nasikampung.info/contents//files/45378875234.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/c569nkqprqqka4n9fu4pq6a67s/6231717353.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607acf110261b---15255915818.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/965a42a54d10953e6ecfa5007823055f/mefav.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/75ansdh4i0jmpju1fod5hs8o0t/47062287960.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=sugar+free+strawberry+sauce+for+cheesecakePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF196 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000109a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A7 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
font_02_sfnt_off00011ee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE8 17288 bytes
SHA-256: 0e8bc5dcec44a37b4e134442d849d69e3254e6ad14af7a9633e4b8199e419aa6
font_03_sfnt_off00014be7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BE7 10980 bytes
SHA-256: bcf1ceec4ab7cb8588350851372fa08e672ce0da01c02e5d6fa23dbc25d1c2a6

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