Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b9950443d6baa42…

MALICIOUS

PDF

73.3 KB Created: 2021-06-29 03:46:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: a5b5dbfc6f98fa96f9b00790bdfbc099 SHA-1: 84188e1aa24eae12e754c7194b4c4299d8ad19ea SHA-256: 8b9950443d6baa42f2a5095b3f77d22e931e2f31b1e930e40f8a2998b2ad08bc
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. ClamAV also detected it as 'Pdf.Phishing.Trojan'. The primary function appears to be directing users to potentially malicious content hosted on these compromised sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160831956b1377---pikidebe.pdf In PDF document text
    • http://hrzservices.com/uploadfiles/file/waduripuzebi.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/nenuxoxiradove.pdfIn PDF document text
    • http://kaushalacademy.org/ckfinder/userfiles/files/rufowedagapefo.pdfIn PDF document text
    • https://jotekonybakterium.hu/userfiles/files/foxaropa.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080dcd3e305e---79900068269.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a564bdc1501---zufefukepaxana.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/5b60c78b3e00d2e6f912d52ea8613b30/pasebanevonopusenek.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/vanepimolofizexuna.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/boxodupadozevig.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/j518r7rh0lr2odu64e807s9adr/39256880331.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/18465aaa07d09c2585ece81b427cef8a/30528518648.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/l1spq2jkt499g3b04k4no0aa7n/16222686653.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/rimazezubutorumazurevor.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/11192169627.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/lorupumaxegunawalunoxiri.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0227bcdca4---11954817274.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160778bf3f0927---9759637527.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/sokanexuxilomuxomegaloxog.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/43545796713.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b84ff4beaef---sapiguvodovuno.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=ameerah+the+sound+of+missing+youPDF 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_off0000b7a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7A7 10952 bytes
SHA-256: 90b09f9b806ab5ae44a675cdd4186ad2346e56234480b3853f45f1b19b268386
font_01_sfnt_off0000d0a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0A9 18492 bytes
SHA-256: a474fbeee1ea01efaceb41364de6788dd78e5282f6dd0ad245fbb42c14454ca9
font_02_sfnt_off0000fe28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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