Malicious PDF — malware analysis report

Static analysis result for SHA-256 05b59d71f3a37dca…

MALICIOUS

PDF

81.6 KB Created: 2021-06-26 08:43:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 10bcd54e5de081d21abb0b242c59c333 SHA-1: 28e60f929561851232bb185fbd59032f46acd252 SHA-256: 05b59d71f3a37dcad60577f6a3b98347d73dc98b07a6711375948a77129691e6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the heuristic firings clearly indicate a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://belgium-ex.com/images/blog//file/waxazavewuturoje.pdf In PDF document text
    • http://mixmarketing.vn/upload/fck/file/subuzu.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/37897991242.pdfIn PDF document text
    • http://huile-de-nigelle.info/userfiles/file/jenibijorunazikajuruz.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/bujuledepasajisotewug.pdfIn PDF document text
    • https://akemi.ro/hirek/file/99557739239.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/gfsjjobpd518blrdcm37tt0j24/32114205484.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609db2450fe8e---gixapiropum.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607bff3d0aaa8---61710628012.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/0608b0e75789897a598babc734a2387b/25725419748.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210510043607.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/potumo.pdfIn PDF document text
    • http://aczelzalog.hu/tmp/54906324538.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/65c1049974ec9e9fa2f81b81278c4e89/16159799602.pdfIn PDF document text
    • https://transpack-krumbach.de/_upload_bilder/_filemanager/file/27720743260.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/wuwexusedufiwovebelab.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/kegakofolarobuzak.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608f10e90915f---61201337153.pdfIn PDF document text
    • http://innotack.com/userfiles/files/bonudoduwetepagigoti.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/bopobilarumujowezujodola.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/f7277c32c8738e56d6e18ca6e8524a11/21632914615.pdfIn PDF document text
    • http://saikunghouse.hk/userfiles/lefojiwemuzekesolin.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/i4roknadsggprivqbma5pdh9gs/96123366490.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/50530557390.pdfIn PDF document text
    • http://blackhorsesc.pl/userfiles/file/rabitoduvomurotitox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=competitive+exams+material+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_off0000dce9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE9 10752 bytes
SHA-256: cc3ca9c7137eacb603b3ba02d155b020c3622d189a1efd0b509d675ddb93a890
font_01_sfnt_off0000f5b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B4 16740 bytes
SHA-256: 06bc2de9c73e6fc8dc9867177d72448748209301d9c507891086403ed2139116
font_02_sfnt_off0001211f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1211F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1