Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5c6bee5a8c1c4af…

MALICIOUS

PDF

82.0 KB Created: 2021-09-06 07:34:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cf36d700f94439f0af28ee3e382682ae SHA-1: 4a8d5d8bcec3a086edad2e5bfc08bda44e73b7a5 SHA-256: c5c6bee5a8c1c4afb91bbea7f11953986beaf10ffc3bc65aca2c0ce014b00478
156 Risk Score

Malware Insights

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

The PDF contains a large number of external URIs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, but the structure and URL analysis are sufficient for a high-confidence assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://charlotteellisscholarship.com/clients/a/a5/a56794a54ce3a7e2a8fdc514f00cf952/File/juwobowu.pdf In PDF document text
    • http://rgn2u.com/userfiles/files/kerifem.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/dizapoduverudalulodolupiw.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16088c8dbbced9---dajejijarug.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/36067708720.pdfIn PDF document text
    • https://retake.dk/ckfinder/userfiles/files/kiwodunaxenetupir.pdfIn PDF document text
    • http://byty-pardubice.eu/UserFiles/File/gosawabatulegubenunosora.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd216f09a87---zikibaritopusijobeker.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/b039f8226118e0743014287c81cb497a/vidipolik.pdfIn PDF document text
    • http://pixel-pro.ru/upload/file/vanamafuxupepo.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/volejokavo.pdfIn PDF document text
    • http://netisiletisim.com/guvennet/resimlerfiles/kavapen.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/72967673684.pdfIn PDF document text
    • https://jeanmarcrobion.fr/userfiles/file/sanabiwetopep.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613299280546b---76088966665.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160711f7e2988a---tekutagave.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/85711281494.pdfIn PDF document text
    • http://zhjpharm.com/upload/files/4754800863.pdfIn PDF document text
    • https://www.domosystem.gr/ckfinder/userfiles/files/duzojiponituwubaxenabela.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210905_279420AEB342DAFF.pdfIn PDF document text
    • https://oncallanatomist.com/ckfinder/userfiles/files/32715117484.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/mejoguwadamiwo.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/od60la65lvr7lm292fjfpes660/guxasesidilofigubimesunom.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609824dd55dec---wixivib.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/nupikewezobonotuleloweg.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/toxizage.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/bb721aca2e530bd6745596f30eede5be/zupetineji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=bookmark+pdf+nitroPDF 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_off0000ddf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF5 10460 bytes
SHA-256: 7e96a78d13fb960677c98501ff507b9d6c50f706b7e7b8db6ebba89d16b4ec5b
font_01_sfnt_off0000f5a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A9 17360 bytes
SHA-256: be7a4bee8046645f0f004e7aad71a1876858cecfd46995b31c975e4477d218ca
font_02_sfnt_off00012280.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12280 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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