Malicious PDF — malware analysis report

Static analysis result for SHA-256 a402f9b676738b72…

MALICIOUS

PDF

75.9 KB Created: 2021-09-24 09:06:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8898ed31f4be00a4ce5632e0376f99a7 SHA-1: 9c21ba6af6cbf15903346c80154e5c67467ad1e3 SHA-256: a402f9b676738b72b0c4952e896f3d845e6f421d630f2d9f5d3788ceecfc8938
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of multiple PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://nomylo.ru/uplcv?utm_term=pokemon+black+and+white+free+download+for+android PDF link annotation
    • http://www.alexgis.com/siteuploads/editorimg/file/sifomeluwiduzokiv.pdfIn PDF document text
    • https://mimpi1pusat.com/contents/files/53357016725.pdfIn PDF document text
    • https://kotypsy.pl/ckfinder/userfiles/files/seditosofilal.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/fipopowolaxovetumexexuzin.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/5426816538.pdfIn PDF document text
    • http://asfalon.com/__files/file/82416498733.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138b96f2a47a---figijezukujavuxiduvak.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161486d717c6c9---66931428293.pdfIn PDF document text
    • http://lixupeng.com/uploads/files/dawus.pdfIn PDF document text
    • http://debrecen.varosom.hu/userfiles/files/79951020357.pdfIn PDF document text
    • http://cartopack.be/Images/file/72309421514.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/55153771973.pdfIn PDF document text
    • http://heatherjansch.com/ckfinder/userfiles/files/85125848766.pdfIn PDF document text
    • http://onlinecommerce.bg/uploads/pages/files/89326849454.pdfIn PDF document text
    • https://spheresignal.com/app/webroot/userfiles/files/nuvusamakijevevafutozime.pdfIn PDF document text
    • http://www.badischer-kunstverein.de/ckfinder/userfiles/files/91388494587.pdfIn PDF document text
    • https://tcremich.lu/files/files/71852645570.pdfIn PDF document text
    • https://optimustelecoms.com/ckfinder/userfiles/files/57840967941.pdfIn PDF document text
    • http://z-i-f.ru/userfiles/file/vidipe.pdfIn PDF document text
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/kivipupilovamefalesodizo.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/xuzuxiwuporov.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8f18697c3---bonezipip.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/ca05453b1bb544a29a131e5b6a552845/wumusawizigomixedefan.pdfIn PDF document text
    • https://www.ojchamber.com/ckfinder/userfiles/files/dinateri.pdfIn PDF document text
    • http://mos-craciun-inchiriere.ro/fckfiles/file/5288474303.pdfIn PDF document text
    • http://simonkuehner.de/gfx/userfiles/files/porufepigolubemodaf.pdfIn PDF document text
    • 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_off0000c467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC467 10892 bytes
SHA-256: 7d694bf15426d6daa19206754d52dd03682cd9c649c36272f38525885bd34e0c
font_01_sfnt_off0000dd6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6F 16888 bytes
SHA-256: 27e25e900ec20fd526911746d4535a5cbea69d662430ca8e16c57ca6292b33e8
font_02_sfnt_off0001092a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1092A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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