Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a6f7454d03b8215…

MALICIOUS

PDF

81.7 KB Created: 2021-07-01 15:01:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: d13682d85356667de49c72ad76e8270c SHA-1: bbd3d0941367ffb0de44647bda2075a20d4f9059 SHA-256: 4a6f7454d03b8215f986e1ce7006aef571a4332b6c2fef0af8711d3af4ef7062
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous external URIs, many pointing to compromised WordPress installations and disposable hosting, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted, but the presence of multiple suspicious URLs indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://wastran.ru/uplcv?utm_term=s+insel+names PDF link annotation
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079d259d25f3---44143486964.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/6e6aa5da675415fa45b550937964d9fc/14705736183.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/e93e41d8db2329688cc09d7d3f90cd75/jenisimepoxexeroxerixi.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/tajipogazukonu.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609d227120a18---95259789509.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081060b9425a---89536127359.pdfIn PDF document text
    • http://connect-senior.ch/uploades/userfiles/file/wifikujuvupikibavonanil.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/4444df35bf7d12baadd12864447249de/67733382435.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a36eba9b1d4---743800119.pdfIn PDF document text
    • https://cvconstructionsgoa.com/pharma/admin/userfiles/file/fapewifi.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609241f68af2f---75066007169.pdfIn PDF document text
    • https://www.latentoac.com/portal/wp-content/plugins/super-forms/uploads/php/files/s6dhm4uucn0ll19v17gb234prc/fasal.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb9194df52e---pidapajisore.pdfIn PDF document text
    • http://tuhs1970.com/clients/a/ac/acc339db084e87cdfae31a76a6c96f1c/File/lefufe.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/7gsm1025s8cdntlg9mkue868ea/55427077600.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/36167767567.pdfIn PDF document text
    • http://leadershipcareer.kr/fckeditor/_upload/file/wuneladigelotiwoxavu.pdfIn PDF document text
    • http://serramentisiciliano.it/userfiles/files/47172535911.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/f3b4cbc88e701b923073fba87477a1fa/betudadozabaken.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/7c11cc7894e2d38c42a046fe05f73d03/27664833623.pdfIn PDF document text
    • http://curtisfamilyfun.net/clients/e/e0/e02f67ab5b6879a7eb6c21a3163f7106/File/pamagu.pdfIn PDF document text
    • http://inglewoodreunion.com/clients/68690/File/sugezuderaxinixigudeb.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/60590745983.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_off0000df1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1F 17080 bytes
SHA-256: 1f9e90907e6166342dc2177665755c23dff1d3bcca3a6529e921665cdd0b977a
font_01_sfnt_off00010ba5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA5 10028 bytes
SHA-256: bf0fb08edc4357892d4662ce505b2bb1c8779dc8b6e06da0f66a5d66785d1d98
font_02_sfnt_off000121ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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