Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd04449f27f5e592…

MALICIOUS

PDF

91.9 KB Created: 2021-07-29 19:58:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 69c703da57a8b555c63fb142ff5178c8 SHA-1: 49065086614836dae7429a6a23dc496e2bf08ba6 SHA-256: bd04449f27f5e592f9c7ebd508b86f5eda05e34ae8b05c659cd969113adf7f5b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a deliberate attempt to obscure the final destination and leverage SEO tactics for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://oniceh.ru/uplcv?utm_term=movimiento+uniformemente+variado+ejercicios+resueltos+yahoo PDF link annotation
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/7uaird9cfs1r58hmhlqjkdlk3b/vufaretinulinofakopab.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/dadb05892b39b8a6980e8e01b2dd63e4/pexanib.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/95173391801.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/7l6o2i85hnq6d8ub78j1kvrcnj/rasibolifobixupijinide.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/mufenevipawedusilexupika.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16086146beb19e---laxir.pdfIn PDF document text
    • http://pes.edu.mn/ckfinder/userfiles/files/gixaxazoxomisumokevasafar.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c974d484427---50837195952.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/d458773793d22b5b528e8f255610e8b2/88879807790.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099943aac266---88111933477.pdfIn PDF document text
    • http://budka39.ru/files/difexojuf.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/a86b56f2cabe100cb1a0fb691a2e68d1/fuvorudotoki.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/22c2cb0e195996dc089f0e1e5e73beb8/bekijirevogeguviwurajusul.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/62245785100.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607527f34837d---tudakoxuwigadotugu.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16098460b3f34a---21240589250.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160bf2261d7a8f---33008840524.pdfIn PDF document text
    • http://mopron.ru/upload/files/lexegoviwofunijamixe.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/97130821883.pdfIn PDF document text
    • http://xtra360.net/campannas/file/kuxim.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/50710450981.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a43694644c7---netutikujavib.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607523240ab86---19488842947.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/ug3fh2akuma753abt0o1aucu5g/46405676015.pdfIn PDF document text
    • http://teplospectr.ru/images/files/xivuvuxefefoxisuluwa.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_off0001043f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1043F 16596 bytes
SHA-256: d6f5af10fb56e43a3169f01307b1214b763612651a639c8ce62691d73e8eaee2
font_01_sfnt_off00012f47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001475e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1475E 11144 bytes
SHA-256: 8701112aba6ad5b3e7efc485f5dda6789905a7e135353d77d32d9f80f31e5109

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