Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdcccb5dcf8cf4ff…

MALICIOUS

PDF

98.2 KB Created: 2021-08-07 02:59:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 08dc5f472540e6183837f9cf8d018ae4 SHA-1: 7c75d9e4b57edfec4152b1cfdfff00db5e1162ef SHA-256: cdcccb5dcf8cf4ff812a03e6fe2bbaeee0f2ca19e6475b843fd8d1f7e156fa46
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple domains, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The primary attack pattern involves luring users to external sites via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/8bdf247f9a18f2a95b593e3ca1a2b691/76459466726.pdf In PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac243901300---42692647368.pdfIn PDF document text
    • https://ht-cooling-j3t.com/contents//files/bebefokakosu.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bfea24757d---xovupodoxuxukiwimog.pdfIn PDF document text
    • http://bvsaigonbinhduong.vn/uploads/files/75095777595.pdfIn PDF document text
    • http://gediklimakinahidrolik.com/resimler/files/85522106228.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/109pojb8q6a49fr10mi50rtk5q/dolomajokegovozerukokaf.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609461c0a11a6---46376732124.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/gipixukepelasifu.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160985a36e6203---rinedageridad.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/40054737885.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/9a5826fbc32ff352fff3e6f54bdc83ce/xarudolukufi.pdfIn PDF document text
    • https://eurotig.ro/file/59957400708.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fbeb48503fe---zufatowabojokalof.pdfIn PDF document text
    • http://dallassymphonyleague.com/clients/1/14/14bb4a025281f1a32078cb68571f7cf3/File/fifilupirowafa.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/30291570355.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a074ba14fda---3429882029.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/93520465077.pdfIn PDF document text
    • http://lightningriskassessment.com/ci/userfiles/files/96494084283.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af7787b6c21---11574773826.pdfIn PDF document text
    • http://disonde.com/filespath/files/20210807050336.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-7-6/20210706084641373520.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/g4ps2m253rdcpf05c2p8fb38ba/36840903020.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=sumas+restas+multiplicaciones+y+divisiones+6+primaria+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_off00011895.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11895 18436 bytes
SHA-256: e948bc2179e89d0782c8272c18f8fe17f68b97a6df911ff77526c5a80d364604
font_01_sfnt_off000147f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001600f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1600F 11304 bytes
SHA-256: f1ed9fc601a7fcddb20e83e99a6794af0054b2c17f23567975b2218a265f6fb8

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