Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec66aef7ebd0e3e9…

MALICIOUS

PDF

82.5 KB Created: 2021-09-21 23:06:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b57fef971f304d5d6211ffd6401d806f SHA-1: 8999317cee67bcb68249c74de0ff9983c2a9dc8b SHA-256: ec66aef7ebd0e3e9985e7af43ec72a2e53c66362f9ecbb836ec821aafe5a8e7a
156 Risk Score

Malware Insights

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

The sample was flagged by a critical ClamAV detection and an ML classifier as malicious. Heuristics indicate the PDF acts as a link farm, pointing to multiple unknown URLs hosted on potentially compromised or disposable domains. These links are likely intended to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://logopeda-empatia.pl/content/file/66133337534.pdf In PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/161389e93ebd6a---sebovafido.pdfIn PDF document text
    • https://waxparadise.pl/userfiles/file/goxux.pdfIn PDF document text
    • https://solener.info/ckfinder/userfiles/files/81186312699.pdfIn PDF document text
    • http://e-sportis.com/images/upload/dotipetozulaxaduladumazak.pdfIn PDF document text
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/82237208660.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614320c77f490---51111236724.pdfIn PDF document text
    • https://leciv.fr/uploads/FCK_files/file/99179415211.pdfIn PDF document text
    • https://2ruoteexpo.it/ckfinder/userfiles/files/53616804856.pdfIn PDF document text
    • http://cross-winds.in/upload/contents/images/images/nuxikezujijum.pdfIn PDF document text
    • http://www.fuchingrading.com/upload/file/45190603470.pdfIn PDF document text
    • http://bebsulmare.com/userfiles/files/98903403318.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16141947b2eebc---16318394494.pdfIn PDF document text
    • https://ismart99.net/upload/files/bezutazojuwowum.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16145099e2b1c2---mebewuzotatepawoputogi.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/pizeku.pdfIn PDF document text
    • http://eastwoodfamily.net/userimages/22822460380.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140b9020a485---34679016765.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/sonug.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614297839a7d8---muxowasoruwetomirowas.pdfIn PDF document text
    • http://sadrokartonyhk.cz/images/fckfiles/file/kusozelari.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/malokebavudopo.pdfIn PDF document text
    • https://www.caissedesecolesdu5eme.fr/backoffice/ckfinder/userfiles/files/venixege.pdfIn PDF document text
    • http://tradeweb.es/userfiles/file/19377320062.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/gemelo.pdfIn PDF document text
    • http://vnationwide.com/userfiles/files/81961539044.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=g+major+9+chordPDF 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_off0000dae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE9 19340 bytes
SHA-256: fd32f698b0845650a8d9df618475eed396c98be26185f29187b9bf272cb001d6
font_01_sfnt_off00010d17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D17 10332 bytes
SHA-256: ece8bd0ffb8f2704e7a317d74ec7edd228f56718f077dd75fed0f397f6f73b7f
font_02_sfnt_off00012473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12473 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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