Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c2caf4f9982f96d…

MALICIOUS

PDF

93.6 KB Created: 2021-08-02 01:47:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: aba8f87d38c72ce12111a91ae2d544aa SHA-1: 060bcd4523532249d66061112d57f7e9208ed8e4 SHA-256: 0c2caf4f9982f96d45d650e979b73eabb157a6da37b6a7abceec8fd28803437e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, so the primary attack vector appears to be the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608010a7dc189---zegefupil.pdf In PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc2705a6832---78946333771.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/fuvolozab.pdfIn PDF document text
    • http://runbo.net/upfiles/files/162703882926.pdfIn PDF document text
    • http://daimarconstrucciones.com/images/admin/file/texem.pdfIn PDF document text
    • https://chptravel.ir/data/file/76624308700.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160a3245527ec0---maluz.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/dudon.pdfIn PDF document text
    • http://indecomavo.pl/inc/xuluporuxumoxanedazakol.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/xekibitatoku.pdfIn PDF document text
    • https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/3851315653.pdfIn PDF document text
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9c6718228---pasatodesofasageda.pdfIn PDF document text
    • http://holzbau-napetschnig.at/xujafazolevumek.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609921db60191---36014270897.pdfIn PDF document text
    • http://penzion-u-zamku.cz/files/file/rirobuli.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/6c1ed0ed8ad226754a0396cf42a94fbd/valaxudadili.pdfIn PDF document text
    • http://turinhotelcompany.com/userfiles/files/zanasigazunuganokakifapod.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/8f76c1554574f2804a4e191bd22e0a58/64323533212.pdfIn PDF document text
    • https://sgotomotiv.org/upload/files/75112270976.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/1e8fc893ff4ce8609ab11079f64fb5b5/5529900702.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/7154dad6aeb92217fa1a43f46291b4d6/22141271410.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a81994c5cf7---fugepuxajupulatawine.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/f5418r9nvkm7mfk3n5p8ruagmm/vomarasexivo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=ps3+emulator+for+windows+7+32+bit+free+downloadPDF 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
font_00_sfnt_off0000eddc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105EE 17464 bytes
SHA-256: 000723e6cde8c096915173638e43e09fb87861a53466346802a6cec57bfb7a38
font_02_sfnt_off000133bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133BC 11184 bytes
SHA-256: 458a3982ccb060ae6b9af811546b1f4a7a59d71df9062db01b1f0ebf60c9eaa6
font_03_sfnt_off00014e12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E12 8000 bytes
SHA-256: 906daacc1468ab9d649250764aa9833f13370451e3c51e99e031031b618e25fc

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