Malicious PDF — malware analysis report

Static analysis result for SHA-256 66644adcdd1726f2…

MALICIOUS

PDF

83.0 KB Created: 2021-07-19 22:36:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 4d039fcb079215daec9bd78ce85d4977 SHA-1: e0455b85ea5a8093cebdc2be95ab339bad98f9c3 SHA-256: 66644adcdd1726f2d5a316f005378723e4c88ddcddbb5d36a315db73446e0cd9
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 or other disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://casaperferiesantamariagoretti.com/writable/public/userfiles/file/gixuxewekubun.pdf In PDF document text
    • http://pizzeriagiganti.ro/imagini_ws/81730874057.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c60e7951e0---28042832999.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160838c942bfd1---pitufe.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a74ab8741---90726366210.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/ziposugaduzotu.pdfIn PDF document text
    • https://bbgpiti.com/userfiles/files/nuvibadapem.pdfIn PDF document text
    • http://altinay-law.com/images/file/lonixenodane.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/83701151090.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607200a794ec6---lunisolitax.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/fed66b8adeff6eae7385cafa63f724a6/17896865648.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/47509816977.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/95176386212.pdfIn PDF document text
    • http://casaledellasignora.it/userfiles/files/23182318689.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/zojunafugibawasuvokival.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/19324827449.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/fosodurilij.pdfIn PDF document text
    • http://gaziogluenerji.com/images_upload/files/23096507768.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/19876cc112ab169dfe3dc2548d720540/60849516931.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/xuzepaxoguzabi.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/86798695772.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/5fc1d3be82030738199e64610ac769b2/8652275721.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=how+much+does+it+cost+to+fix+ignition+coilPDF 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_off0000e165.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE165 10940 bytes
SHA-256: a6aaea67431cde1e4701da1e5180b251dadd0627f27e1c7cfb0969554308cc32
font_01_sfnt_off0000fa67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA67 16872 bytes
SHA-256: 5bf5e5097a030ace87b85401291bdd894abb3ef2c553f75e61a437e285df90dd
font_02_sfnt_off0001266d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1266D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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