Malicious PDF — malware analysis report

Static analysis result for SHA-256 d482119816fbe7f6…

MALICIOUS

PDF

94.3 KB Created: 2021-06-12 14:52:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 3aaa4d5e2b2a4dbcfa99e750992d39da SHA-1: ace0f70b4c99ac31ea190f9119274af4bfca213c SHA-256: d482119816fbe7f6ea535fa18b9fcc698c7d30d879285cc3dde3494af8d1c755
96 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is identified as a link farm hosted on disposable domains, indicating a likely phishing or malware distribution attempt. The ML classifier strongly flags this PDF as malicious, and the presence of compromised CMS upload links further supports malicious intent. No scripts were extracted, but the document's structure and embedded links are sufficient to infer its malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 https://medvor.ru/uplcv?utm_term=beauty+behind+the+madness PDF link annotation
    • http://agnieszkapawlik.com/userfiles/file/lebigetapisedaxovusana.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a61fec312e0---gedokarepuxuzawabi.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/cl41m065vkv8u27dhk8rku0260/73992491506.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/a87785c90731c727b3d4d5d4c33bb29e/55346796677.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc84d97805---wisozazaboneborixusova.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bea5ba842f5---87459951793.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/oto95ipvh9gm5kbe0ii0u24eoo/zitoloninerobanuj.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/walolem.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/52uiooi5djjlgoe8tjo5vn7ru4/5577814646.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/d8b8e906cd1b3224f37eb7db7029fae8/18359803255.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/50d162314da5da48b46a6fb9dfc28d61/jejetaboxedab.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b3b9cbd98---82341067027.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608338c9cd394---14207906837.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11367 5228 bytes
SHA-256: 97ff6984a2366d8cdc4999221d12dc470d20ec1fba1325ae7332d57b8407f20e
font_01_sfnt_off00012500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12500 8756 bytes
SHA-256: 160e7e82ac7c0f17a25a962a90f8b34dc24311bb8b2c1d0654fc2404a4f74215
font_02_sfnt_off00013d33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D33 15248 bytes
SHA-256: deba5673e8a7d8598dd80f12cac2d95c66d52c8c12be1fd10618557f99af7fd8