Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6c1269ae4fb0800…

MALICIOUS

PDF

80.5 KB Created: 2021-09-02 00:05:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c0eeeefffc36e847ec06ff750105a30a SHA-1: 25f0b25deeeca9c6e4fde6a354ba19ca44e4dd73 SHA-256: c6c1269ae4fb08003628816633884b56bf7565f2c3f99811d55188b80135dd8d
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress sites. The ML classifier strongly indicates maliciousness, and the link farm structure suggests an attempt to redirect users to malicious content or phishing pages. No scripts were extracted, but the overall pattern is consistent with a document used to distribute malware or facilitate phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 5

  • 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://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/gn4ohcrefai84v4v9mcinqcag6/vejofegogujififuv.pdf In PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb77457c293.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944c3e70720---safinevifagujozik.pdfIn PDF document text
    • http://kag.fr/userfiles/file/fanuxigiruteripegijuku.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160859fa3c7be5---13438759390.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/92cb88bf6359f92b135ff3ebb6da9454/dazakozinoj.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/gosofi.pdfIn PDF document text
    • https://macroedunet.com/userfiles/file/86843866686.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/8cae92d874dcba4376ce6c0a45f13585/15309347574.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/paximisazanasudewas.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3c875d784---jajogokulizetudevetid.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/84486606575.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b5b22b5a6f7---levatuziluzisuteva.pdfIn PDF document text
    • http://uniquehotelsolutions.com/files/others/tiwof.pdfIn PDF document text
    • https://airbays.com/userfiles/file/40296381994.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/dumokavuzumixafupuvemi.pdfIn PDF document text
    • http://www.mamafoundation.cz/ckfinder/userfiles/files/rozowogekokofafexo.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160701505c60a1---33370009926.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/71412195611.pdfIn PDF document text
    • http://aapltd.net/userfiles/file/wesokevanovovitizexosi.pdfIn PDF document text
    • http://888chji.com/userfiles/files/5635957788.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082b2dc0fe8c---87872261143.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=example+of+a+two+column+cash+bookPDF 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_off0000d522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD522 17924 bytes
SHA-256: 1630cca1cb18d9ada0cce0aa94a2cddc27c66fa189f48d20aca427b9114efb67
font_01_sfnt_off00010346.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10346 11056 bytes
SHA-256: 6b2fdf214a1a9eaa7bcb16fd932e27086dbac320eb0edfe1f4d82b82d06f939a
font_02_sfnt_off00011cb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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