Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0f1a48c239232c2…

MALICIOUS

PDF

79.7 KB Created: 2021-09-02 15:14:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 051092c27ad2d93a750326e20d0e479e SHA-1: bb81b7cf268440cbf823897c9baef303296105a4 SHA-256: d0f1a48c239232c2eecf446ad2eef2967068ce6479a5dcf7ca54ba02e9935677
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links pointing to compromised WordPress uploads and other disposable hosting, suggesting a link farm designed to redirect users. The primary attack pattern appears to be a phishing lure, leveraging these links to deliver a secondary payload or redirect to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://garglob.ru/uplcv?utm_term=trimaran+design+pdf PDF link annotation
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ae935a74cb7---dutevazewasaf.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/libopurimexuzotur.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/benotimaxinaval.pdfIn PDF document text
    • http://hopkinshigh1961.com/clients/878968/File/86132212837.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0219a4f07eb0fac29faebc0672693f98/76418395833.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/16057218952.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/195f257dbdaca6dd5c3b55756acaf5d0/49321953237.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/6967635046.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/ot1ps79539rkbemt5kjckbstdf/42738171275.pdfIn PDF document text
    • http://ourdesign.hk/ckfinder/userfiles/files/29859795907.pdfIn PDF document text
    • http://haisushitogo.com/uploads/files/kedalegefatugimed.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/62443600407.pdfIn PDF document text
    • https://daqing-jewelry.com/uploads/files/202109011652245610.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/pezovenogunozajorokipuzum.pdfIn PDF document text
    • http://auburn-properties.com/userfiles/files/9669971485.pdfIn PDF document text
    • http://diegogenna.it/userfiles/files/nedilobuzo.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/8711e88536bbf724eae9c09bce8750bd/nadewuwebotixeribo.pdfIn PDF document text
    • http://pelesiuvalymas.lt/i/File/xizarojulesofesebekogi.pdfIn PDF document text
    • https://tumsad.org/img/editor/image/file/39645290840.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/33636649464.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/27a5c4dab3a976fe90e986ab6adedd9f/nenudexifasufibisumus.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/88a0769192a8d85967af83c01ce0157d/22472562473.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160878f049d202---83839937927.pdfIn PDF document text
    • https://rts-wm.com/ckfinder/userfiles/files/vuxibunelaxusirexi.pdfIn PDF document text
    • http://dietaltop.com/userfiles/files/xukexolopipuvukunoloxifa.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_off0000d2de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2DE 10540 bytes
SHA-256: 19dbffe499195ed5f2432e96f7ffc7c331b9c2bad74a8c35dc80fc1ed533f8e1
font_01_sfnt_off0000ea8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8C 17840 bytes
SHA-256: 03b2c18fb988d6ad68298d13bb001d9882d1034355edb0b969dcad7bc6191c3c
font_02_sfnt_off0001190c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1190C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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