Malicious PDF — malware analysis report

Static analysis result for SHA-256 c69ae1c5cbc51747…

MALICIOUS

PDF

71.3 KB Created: 2021-09-27 23:30:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: db48cafd0b3968cb6dd6e488819e3ad3 SHA-1: d7e9d84001e3c5034d699ab6c4ade501e91379f3 SHA-256: c69ae1c5cbc51747cd8fb059d34223ea47718c054a85eedd5556e0ec154cacc0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous links pointing to compromised websites, indicating a phishing or malware distribution attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests a link farm on disposable hosting, further supporting a malicious intent to redirect users. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

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://palezieux.com/ckfinder/userfiles/files/71296871587.pdf In PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613b81f76539b---rutemawisifanimegoxagef.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/6ihc3k9a4pj78kvmqcu3rchngv/dukesarokekel.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/161422db753bc6---88961097014.pdfIn PDF document text
    • https://wtmasonry.com/ckfinder/userfiles/files/96482349624.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/f1ad17282ed2f850dd7c3f9f9a424eea/junezigixinidojobo.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/20452232115.pdfIn PDF document text
    • http://bbtourcanada.clickis.kr/FileData/ckfinder/files/20210919_F69FECFE8C00417F.pdfIn PDF document text
    • https://magicdiscoradio.hu/userfiles/file/18654140784.pdfIn PDF document text
    • http://hoya-system.com/uploads/files/202109201454141127.pdfIn PDF document text
    • https://speculatio.in/userfiles/file/rozelagejoluruledoroze.pdfIn PDF document text
    • https://emenu.hu/editor_up/74547580162.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff1557b407---ropasipumofaroxalujimozo.pdfIn PDF document text
    • https://krantiservice.com/ckfinder/userfiles/files/33222775941.pdfIn PDF document text
    • http://puebloexec.com/userfiles/file/23992034999.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/0b36cf79622fead72f8d0332146554f8/nujaborebitojibaxaju.pdfIn PDF document text
    • http://kosmonautika.ee/ckfinder/userfiles/files/79356425960.pdfIn PDF document text
    • https://olgunbey.com/upload/ckfinder/files/rukujabanurofe.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/negetogumotivavubebup.pdfIn PDF document text
    • https://okinawa4d.com/contents/files/jevovoroteliromadat.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/22573412566.pdfIn PDF document text
    • http://studiomistretta.com/userfiles/files/69517237139.pdfIn PDF document text
    • https://etcbt.com/userfiles/file/bivowokabasosexidoniz.pdfIn PDF document text
    • https://youxsoft.com/uploads/files/14606558143.pdfIn PDF document text
    • https://makiriaszto.hu/ckfinder/userfiles/files/10448121486.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=how+do+i+delete+a+draft+text+message+on+androidPDF 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_off0000b3b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBCA 10876 bytes
SHA-256: 515558a1a478273762008e61fbc4ac9ada5b0d733ad5b11ad0027a5e815cfe6f
font_02_sfnt_off0000e4b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B7 16628 bytes
SHA-256: ca0e2250f72b0675670c4a930d27bf3304108b44a2152871c7502144ceadcfa3