Malicious PDF — malware analysis report

Static analysis result for SHA-256 b99d54f58c5a9580…

MALICIOUS

PDF

84.4 KB Created: 2021-09-03 20:34:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3d72228ec270010d6e975304de97a12d SHA-1: 388d40bb41a6e29e65ce9b76009d60ff3589cc2a SHA-256: b99d54f58c5a9580f93bc0e7e00c46e169d543c9f354a3c5cdc38bbf24225fab
156 Risk Score

Malware Insights

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

The PDF 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 CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious or phishing content. No scripts were extracted, and the document body was unreadable binary data, limiting further analysis of specific payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/8d1906d11d624378e6b609019a69b926/43431745820.pdf In PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/xizedavaxuwedirirosuwesu.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1611220236a584---rajiwukovase.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/dibumitokid.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1610ee0ae6efa5---jibetotedanamarevimu.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081e96303a54---18590563278.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/4c5a8dbdafb0fb0f9781eb47c10986d4/xosanidawuvaronikukor.pdfIn PDF document text
    • http://toddfamilyreunion.com/clients/4/48/482e924d5a052aa4a0c13eb8a30e0bc8/File/87905936347.pdfIn PDF document text
    • https://shieldtech.cz/ckfinder/userfiles/files/38598562984.pdfIn PDF document text
    • https://plagij.at/ckfinder/userfiles/files/budakilulobesonasevogul.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160f1a5302eb8c---77296330598.pdfIn PDF document text
    • http://firmen-bekleidung.at/userfiles/file/38760376899.pdfIn PDF document text
    • http://bendhorseride.com/userfiles/file/93174899186.pdfIn PDF document text
    • http://synerfreight.com/syner_upload/images/files/wiwavojoso.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/96392506012.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160c268500de78---xavubowesu.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/b5cb58d13146b5d9f5cfb863390c1fee/mosepopu.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160796ec591bb5---divorovinifuwofefupuget.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/38986840029.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4599395517---punatedukifofifurab.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/50b8b5e6796cc2ea6ce6eb56a5d306c8/lezujabomizagemabos.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16084fca54cdd6---60468695167.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/30baa18f2d95b9904ee2651c33521d84/dokobumikenapuguxarego.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/j0tjf83vjm4rpmp8hbjvpiu2dv/potaboxikid.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ae5ed36ac55---65423028525.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=customer+experience+meaning+pdfPDF 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_off0000e445.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE445 11148 bytes
SHA-256: 4fa598946e3937a824fc128c0dcc5872a75d7011f45c86857416d2fd52655249
font_01_sfnt_off0000fe30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE30 17532 bytes
SHA-256: e57bd4366e604b06d79ce1a18d9b224e37e341c29dbffb4c8beb8f1c37baded4
font_02_sfnt_off00012be6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1