Malicious PDF — malware analysis report

Static analysis result for SHA-256 0770250b4ab38c1f…

MALICIOUS

PDF

95.5 KB Created: 2021-07-22 05:24:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1a903307a2f2f3c7d5a7566f8e05c8f3 SHA-1: 655d3502f827e7ad3b767555c4dbb61731efe3aa SHA-256: 0770250b4ab38c1f42a9bb5d3ecbeeeab6c0f029d0e9e7f54db8f5579bcf9dec
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm designed to redirect users. The 'SE_PAYMENT_REDIRECT_LURE' heuristic indicates the document's content is designed to mimic urgent financial instructions, a common tactic in business email compromise attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/4b709ebee4c1cbcc4791ea2a5fdf5358/jesupolamedonuzo.pdf In PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/2bf3e66e2f8cbba9654bf91dd0092535/88569050047.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/futisar.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/b87df99bcffccc701c2e815e474067fc/23818089509.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160d9cb8ab9b72---90411215601.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/liwedoloritixogivez.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/2455347603.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dab4f89b037---rurejolapazubotow.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/73k6k2o6u7v98t1e6dsuu0a1s7/pamumexisefanitafedulolew.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd41bc5534---favisiwunadaxesomasetikaw.pdfIn PDF document text
    • http://nano-vip.com/ckfinder/userfiles/files/navobiwewewaxovugu.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/7bc6f6eccee1ad72036e615a5ea0b5b8/vadenowevuga.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8e19cad6a---17365707973.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/73c62a75d032d2c1da151d612f7a553d/vavekizowuralixif.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160dd7e239457d---41335083098.pdfIn PDF document text
    • http://lesen-und-schenken.de/userfiles/files/vonubutofowok.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160de22836c8bd---miduwavobubitafujiwu.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8d94089ca---83986807463.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4e1854d86---bewuxevofedupowade.pdfIn PDF document text
    • https://www.antoniopopolizio.it/ckfinder/userfiles/files/lavulatemugi.pdfIn PDF document text
    • http://multiairservices.com/multi_air/upload/userfile/files/ditijejudowiwawitinolub.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/samocchp2rnhbap9kj0hj75p45/28587236757.pdfIn PDF document text
    • https://bamor.org/userfiles/file/wevararivi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=powerball+results+19+january+2021PDF 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_off00010c14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C14 18552 bytes
SHA-256: d430089afd8676c6d5726f9ee1292335e5bc021001416ebffc4844984a9524fb
font_01_sfnt_off00013d46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001555d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1555D 11044 bytes
SHA-256: dc464444c0cfad729e92788c04bb4d04d55cb0cbe177c9bc97209749caf1fc4b