Malicious PDF — malware analysis report

Static analysis result for SHA-256 64b5fa17658cc686…

MALICIOUS

PDF

92.0 KB Created: 2021-06-28 19:14:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: ed62a554c799acf3ee92164701c38b76 SHA-1: 50d4e0c37cea4fa852217d7e8a8d233f5f217a1b SHA-256: 64b5fa17658cc68603e5eb279bf6c04f998fb3df369fbb0a75f1578ecfeaff63
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to redirect users to malicious content. No scripts were extracted, but the presence of numerous links to potentially compromised sites indicates a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://ivanda-commerce.hr/userfiles/file/22694587759.pdf In PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/f502eeb0d9c14c578823548cea094a8a/47498529251.pdfIn PDF document text
    • http://abpaluso.com/upload/file/82244933558.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16086ce8f1af55---9872691970.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/11784482881.pdfIn PDF document text
    • https://hmanagement.net/userfiles/file/18231660060.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b27b4163553---79829862730.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/47987167171.pdfIn PDF document text
    • http://aven.su/userfiles/file/movekefenevizumudoluful.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/0db44d31684996db892c8a886c6d78da/95940410407.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/telewanovizagutakisedole.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d345d3f26d---11573071820.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/13161568219.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083c202a1c0c---xoreketikurixevugo.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/n2a4prmqvf55ee07429899tfjd/77952118796.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16079160f1029d---tajinulupeligida.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac9cc896f59---zijixuwonukaxuna.pdfIn PDF document text
    • http://k1a.ru/images/files/file/kopiveperelow.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/333d9e26f52eee52a5e0a74b1425eb0e/rogakibubifovim.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021062300474078.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/rugulumililutipuwuk.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/3d6806244bfa560ab709f10ecf40c4a1/fefalinuwomu.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/24c0ff0240c25bb146cb3e693b6472a1/gupopagel.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/uoit03vb3el9ucvfo76pldfcos/wusasi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=mechanical+engineering+for+girlsPDF 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_off000106b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B7 17000 bytes
SHA-256: 76f7ed00d5d46618ede56f2de21d0c671f210c025b5a1545219307518ebc0b4f
font_01_sfnt_off000132ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014b04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B04 10508 bytes
SHA-256: 9538639bd042085f94a48ddcfefc31faffdac09e4a14e12cc74b0aa45d3d1d24

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