Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4052759d4f3f9a3…

MALICIOUS

PDF

117.0 KB Created: 2021-06-28 09:24:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: b5edcbedb2268228f2637a53d5032970 SHA-1: 1eb9cdb19ac2e47ba242de622eb6b9e462a7a3fc SHA-256: e4052759d4f3f9a34f15e56fec488ece85cee527f18fc96446ac7d32a7f0e5a2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a ML classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to potentially compromised or disposable hosting sites. While no scripts were explicitly extracted, the nature of PDF-based link farms often involves JavaScript to facilitate redirection, hence the inclusion of T1059.007. The primary attack pattern is likely spearphishing via attachment (T1566.001), aiming to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9887

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 http://libertyquad72.fr/userfiles/file/5673259289.pdf In PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/navavumi.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/gojaf.pdfIn PDF document text
    • http://cokhiminhhien.com/media/ftp/file/gukenarizefakimunu.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/6farjb5rlhg0ev7ufh4fltsjn8/59462332027.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/efa896f1b9378351fb6113a626b04398/lazisenekuwagobib.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/xixukuronekokikogupuga.pdfIn PDF document text
    • http://taitung-house.com/CKEdit/upload/files/91630015565.pdfIn PDF document text
    • http://hkalc.com/userfiles/35631607945.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/dufoxekejebinoximimosuz.pdfIn PDF document text
    • http://studiobardinisrl.com/userfiles/files/91906524981.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/6fa7f06139f1433d5f88793cc0f2d2ef/86469066970.pdfIn PDF document text
    • http://aven.su/userfiles/file/82475290970.pdfIn PDF document text
    • http://ydis.kr/userfiles/file/231057385048.pdfIn PDF document text
    • http://namadagaskare.ru/ckfinder/userfiles/files/denonalezeboriferipa.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160970693472a4---48913595677.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087536573b79---4265984552.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/zasipa.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/296qf1ab0ab28rud5cf75j75sd/38517246685.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/rq2spocnrlcdbi0sfe0dv422i5/refenamu.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/1388a26fe4e1deb06769b60f1ef81a06/xomifijozinilopow.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/38evvu3u93mql7fm2p56cv37h5/fipulogajobi.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607c43c5d538b---88603011888.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16072fe4c7e369---dapovomi.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/xubowapivosozoki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=smuggs+country+storePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000190a2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x190A2 17940 bytes
SHA-256: c37ec4ff366a6f850d923de359a486ac7d7e2b22a458739c717f0ce8afa55f87
font_00_sfnt_off000149f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00016202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16202 17740 bytes
SHA-256: e7b99e344c293c11837acf72aeaf81b658c8028732f5ae81bd79456f9d578257
font_03_sfnt_off0001ac8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AC8B 10564 bytes
SHA-256: 736d79a1b35e3a03b47c3eee79e0e1d48a0f3c83b19b7f952de1bb7f3477c54d

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