Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ee3e5a1d737d205…

MALICIOUS

PDF

93.7 KB Created: 2021-09-07 13:19:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e917ecf61462822a1f48becac77be53d SHA-1: 0a0b0c17dfa7c80a67aec5642b16a8c3ccf7cf93 SHA-256: 9ee3e5a1d737d205be1243e4b1d6254dd791579ea6d01c5e38afc9ddfbcd39fd
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16084fc1f4e06f---47644561498.pdf In PDF document text
    • http://doggystylzgrooming.com/admin/photos/file/nebazowaxumaziwawujoti.pdfIn PDF document text
    • http://gitimohammadilakhimpur.org/ckfinder/userfiles/files/pojewejibidobabevitiz.pdfIn PDF document text
    • http://oodow.cn/upload/file/210624203403402211t55kw24bfz71.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/42518104378.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/ebc4cb25c76a0b8720f9b90cdfdb2e5b/bedadumojanimov.pdfIn PDF document text
    • https://bem-sa.com/img/file/vogofatakaladomufexek.pdfIn PDF document text
    • http://dogalakustik.com/depo/sayfaresim/file/feniv.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd7469b71a---36295966881.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/42456ac64109e0bb328f20fc424651a7/fanisapimuramusagosud.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/4fc087db13f6c8eccb22e5703fbc3f07/62693886285.pdfIn PDF document text
    • https://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/1f70cc88cfaa1a88386ec149d6a90b7c/gikavazenitafifevike.pdfIn PDF document text
    • http://pecsimutargygaleria.hu/files/file/46580466895.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/c0657f9aede359040f87311b905e55dd/13768241577.pdfIn PDF document text
    • http://papierplus.pl/userfiles/file/98014546629.pdfIn PDF document text
    • http://drxzhang.com/userfiles/file/xidikawokaselun.pdfIn PDF document text
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/94041185565.pdfIn PDF document text
    • http://bipaf.org/2009_home/upload/editor/file/5667404470.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/5af10caa01acf534020d5c6c26048a84/sukizawowukeferadunasuka.pdfIn PDF document text
    • http://heibldr.hu/FCKfeltoltott/file/50238765643.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/m1775rkuat73p4rffpv269hr64/14982115050.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074b3be3a782---92148778314.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/ithbfn27udvafcv9do2jcno9pa/48045821766.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bf56a1a4106---83490384077.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///vebiwiwemaxositisi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=acc%2Faha+versus+esc%2Fesh+on+hypertension+guidelines+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000102ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102AD 11196 bytes
SHA-256: 5f9b9dc58933c8c5c9cc1aa2bbb127153c12e80d871940fa3c80e1fae5e6ca2a
font_01_sfnt_off00011cbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CBF 19676 bytes
SHA-256: 978aa3dcc42966756c12dd21c468be3243d76713981778e1f6c39cb1145d17c4
font_02_sfnt_off00015052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15052 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1