Malicious PDF — malware analysis report

Static analysis result for SHA-256 f758a5243b9f3c7f…

MALICIOUS

PDF

99.9 KB Created: 2021-06-28 07:05:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 7377f1bdec83b967dc5cb2cc0bb324df SHA-1: be9a07cee34cd400cf6d16de704173de51e4ca24 SHA-256: f758a5243b9f3c7fa9b942ad290772c206a8286e9dda38fc1ca60983d21986ef
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous links, many pointing to compromised CMS upload directories and disposable hosting, indicating a link farm designed to obscure the ultimate destination. The 'SE_PAYMENT_REDIRECT_LURE' heuristic strongly suggests the intent is to trick users into believing there are new payment instructions, a common tactic in business email compromise attacks. The ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9800

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://eyetracking.pl/userfiles/file/82799595561.pdf In PDF document text
    • https://equantumconsulting.com/files/files/40700689897.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/7b626430918e483210c127cc00f7f330/49639392354.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/fuzivadinixikerujamalewo.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160d51591bab1a---befumurajawidefixefuxir.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ef99209d9---23361782658.pdfIn PDF document text
    • http://dailymaytrogiang.com/userfiles/files/dikejepalubor.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/7e32faa9ce2a50071d13a78fc938563d/36165120293.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/um6qt1k742tvnb4al7mvdbmjpa/86107922894.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/xuginefewul.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-6-20/20210620200918526631.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/luzila.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16072fbed122ed---10314401394.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a5878f1d5e6---72270899652.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/f4149907763cc190d40e56e891811105/53226648811.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4ec374041---55524397713.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/22431411447.pdfIn PDF document text
    • http://arlingtonhigh1960.com/clients/881088/File/sulawojutenanosafadoxa.pdfIn PDF document text
    • http://ahsaipu.com/v15/Upload/file/202153852542284.pdfIn PDF document text
    • http://xn----9sbbnbtte4cyg.xn--p1ai/ckfinder/userfiles/files/rutazarejosovunujis.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607948f14ff04---63228713232.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/10p8mp7g6m3ludi9vne7usm99l/zivetobalof.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4ad3186f01---42454272207.pdfIn PDF document text
    • http://shsclassof1959.com/clients/a/a7/a7a82b2a6025f7fafce5d77be70bf845/File/litejiwipexozer.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a61a18d79---56681418595.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c467d16ee36---66436138250.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=the+original+wireless+network+privacy+and+protection+standard+for+wifi+was+known+asPDF 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_off00012285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12285 17020 bytes
SHA-256: 2d2eed6732b2a3141492a2323c5665c59ce9fc0d7ce5737dd9e53e346c4669df
font_01_sfnt_off00014edc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000166f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166F3 11220 bytes
SHA-256: a3f5c35b61d4886f28c78c59172f5dc4b67ec95818acdaf6368f61ba219f6ceb