Malicious PDF — malware analysis report

Static analysis result for SHA-256 36dfc19541bf1a40…

MALICIOUS

PDF

88.4 KB Created: 2021-05-10 02:10:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 077349014fdaec4608474560893cbbc3 SHA-1: c55b9e6d3ff955799505845061f5dbc14d15cf2a SHA-256: 36dfc19541bf1a402c280eb338865aa319897581ecc134bc08351e5dcca5c943
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting, likely to lure users into phishing or malware downloads. The document body is heavily obfuscated and appears to contain metadata rather than user-readable content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://cructi.ru/uplcv?utm_term=ciencias+formales+y+facticas+filosofia PDF link annotation
    • https://hirurgija.me//files/tejobavewuvamedi.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/4cb8ba2a135a8492cef3815296866841/12443771129.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16095974a36978---61950537600.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5366cdc52---vaduforuxuzedetadopidebut.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/c4aeb79bb1190a6a7702735a0fc9e528/12456938328.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/4557ae89ea9f1ae244c538de6d4fd147/rajipusudibod.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/9oomvhgpk50goq88qs1lbcvh51/2075579404.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/li41pr18q9rjdr9eppoj060tl0/gasiwonu.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/mokuropepuziw.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/206129411667923c7261e8094abe185e/zepebuvovigomovuwadobir.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/pberv6o39iecitugqfqri2oas5/wukojekuvevewufutojavi.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/96043959431.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/lozineg.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/0ad290f40bbfa7d79cfb8b6734285c90/bivumaluzuditopawika.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160826d6d2d3de---73378646196.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160759ac39cc39.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607621ab71e62---16880742407.pdfIn PDF document text
    • https://salubrismd.com/wp-content/plugins/super-forms/uploads/php/files/ace0d4508ad1fd4d4571cbf56de85437/32940720617.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dfb524fcb1---jeboziver.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001146f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1146F 1664 bytes
SHA-256: 48acd444d36e1b8e04dd127465e0436e38eb2cd03139839f3aac04b4c3be6e99
font_01_sfnt_off00011c65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C65 5032 bytes
SHA-256: 19ef4c2ee96058234702d8ac4ae33db068a4f01dc376935108451b95c588cdfc
font_02_sfnt_off00012d73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D73 11416 bytes
SHA-256: 147cfd5f035dd2f9e5f7c1ec1b1e7bdc10b3a2fbc707aed7236e4f1e3e557961

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