Malicious PDF — malware analysis report

Static analysis result for SHA-256 67812312a34c7556…

MALICIOUS

PDF

92.5 KB Created: 2021-08-03 18:51:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3237acba17bf7ed3d60f4a9b7ba090c2 SHA-1: d9f6fcdee34322e02266ced53e57fefffca7c3bb SHA-256: 67812312a34c7556138d8ebafccee39ea685faf01c86011d161edcf63b8db992
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, while some are marked benign, are part of a larger pattern of redirection to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/gpbnsitstn83hbrtl3vp8ihhqg/43456301609.pdf In PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/p0ijmpfn7lkf4hn9oa2nboarlv/5229243650.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/un2qakc9u2nkv544cvi5p2q8md/nakef.pdfIn PDF document text
    • https://bbmint.com/userfiles/file/wimun.pdfIn PDF document text
    • http://buchtel1967.com/clients/26382/File/69899251716.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/8028c708eb34897176789f24c383b371/wolofowewononurogesowon.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16098f585657f9---65605019865.pdfIn PDF document text
    • http://ihdbd.org/upload/files/bofanukeludanak.pdfIn PDF document text
    • http://mlsy.cz/images/file/files/25593810777.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/d6cnbm64qj0200a02bd65sobba/12280798849.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608778bd4b511---48949104722.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5a5f7e6cf---wifexik.pdfIn PDF document text
    • http://atek-ent.com/upload/file/90257710766.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/61205165112.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f9bf265ae---65825525464.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9c040223c---97038238571.pdfIn PDF document text
    • http://maciejabramowicz.pl/upload/files/file/82335532028.pdfIn PDF document text
    • https://sayurhijau.com/contents//files/24544192536.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/469771b73d8cef03ef8260a02046be22/13480428115.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b48873557fa---xafobakafe.pdfIn PDF document text
    • http://nebovsem.ru/app/webroot/files/files/tomovalejelam.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/4a2cd555ee4d4232ef2e348a1341e72a/56779250944.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073a06a336af---tabigemadisufutamuso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=how+big+will+my+puppy+get+calculatorPDF 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_off0001062a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062A 17400 bytes
SHA-256: ebc041bf808ac63ea5ead8df9d403d86b1d8f504de9e7c5db82bf77c18d158c9
font_01_sfnt_off0001335f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1335F 10876 bytes
SHA-256: 01b2a1b14c033fdce9d0cf64dda8b62e5748b97eca6b33bcbfff7018fb1f5d0c
font_02_sfnt_off00014c5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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