Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ba7dc12b8f35ad7…

MALICIOUS

PDF

184.0 KB Created: 2021-07-31 03:20:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9f7b60e1bca60e68b5a36775d0d635cf SHA-1: 4c5816fda59baf0e4dec8f5057dc1bc91400194b SHA-256: 7ba7dc12b8f35ad71a2c41b1f8b36a076ceec5e8b58e5f63be6c8596c6408b95
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for SEO spam or phishing. The document body is unreadable, but the heuristic firings confirm the link farm nature of the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/605c9144cba1b4000691e3bd52f8afd8/joxifesuxerakagisodasora.pdf In PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/eabba3271e3409b77f8cc44f0825d23c/13067478176.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/27c626b58a67f90c2041135fdb247327/85388369427.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/43120355207.pdfIn PDF document text
    • http://abnicum.ru/files/file/jidupunezadegos.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609becd64d339---67626615564.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210616_EF35CE9BBE236D09.pdfIn PDF document text
    • http://sintellect.ru/Repository/file/gizowepaguwatunilegi.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/kedanuropibesaxefeke.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/forax.pdfIn PDF document text
    • https://restavracia02.com/userfiles/file/67360515918.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074713f20ab6---77351030153.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d053c36f57e---kamenagakidovapexosarefa.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae8216171e2---mipenobovemokogoneze.pdfIn PDF document text
    • http://yongqingtech.com/d/files/50685249145.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/1pcvo9kjb2ug1htsek1saak772/vipasikotitopivafir.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/a082aa8ca09f05e6f04e8b3fa1379c3b/94034315483.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/aon5unrvuj02bjm0efmsm0lv62/xusunakemugutigodopegi.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096cace1be93---61614324102.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4e866cabfe---tazebibolezir.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078a98d5d8dc---mosakamoxaviwosepubelo.pdfIn PDF document text
    • http://belloverde.net/emailer/file/zotubuxuzev.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/52e0eb848eff245a0cb2d6f113374f93/70647118627.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a23b96691---najoribasunejobagifar.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160709bd4b943c---vonomezabi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=diferencias+entre+modernismo+generacion+del+98PDF 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_off00026bea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26BEA 19588 bytes
SHA-256: 353017dbd756f47de8812ce31fa64658fe8771b50d6befd52a122672817fb1a2
font_01_sfnt_off00029dcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29DCF 11196 bytes
SHA-256: f500181f3ce624a8d9fb39101abd88edc033b3d2dabe32643ff9f363a74f9f11
font_02_sfnt_off0002b7d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B7D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1