Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5c691d17b310edc…

MALICIOUS

PDF

78.2 KB Created: 2021-09-04 18:03:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b6af206a7b7a7cd8453afbea122af44e SHA-1: 39f650dfd66acefdad2c5629fb960a71cb885394 SHA-256: c5c691d17b310edc08cae82cf3089293500b80d2495826a17ad30d02bff1f51e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://coretry.ru/uplcv?utm_term=simple+future+passive+voice+exercises+pdf PDF link annotation
    • http://fleshlight-tw.com/userfiles/file/sorev.pdfIn PDF document text
    • http://rcp-ranstadt.us/files/2832773929.pdfIn PDF document text
    • http://bowlingkillers.com/imgdb/files/fuzezurumunudaw.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/vh9qkpcarve51ams65qirv5j0h/98199213702.pdfIn PDF document text
    • http://ourdesign.hk/ckfinder/userfiles/files/81281742302.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608126e2a721d---nevinaferawodozi.pdfIn PDF document text
    • http://aci-immobilier-douai.fr/userfiles/files/zivido.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a17f687b91d---33686716744.pdfIn PDF document text
    • https://dongphuchuytai.com/upload/files/nigitulanufomaxave.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/dovuzosixobilaw.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/jujojixaxijotuxo.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0d83f23b9---verulifawulazixofa.pdfIn PDF document text
    • http://viettelhaiphong.me/data/dulieu/files/15140499348.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/44976751253.pdfIn PDF document text
    • http://www.lugashotel.com/data/editorfile/6657936186.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/ede57f550aa0149ed0d796940bd4b4a4/74043960489.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/37081196268.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/3c5b981d5b4f5dc7c07fb83e044799e0/41590895219.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/xerojazukegupifug.pdfIn PDF document text
    • https://nusamulticentralestari.com/Uploads/userfiles/files/3921204186.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/951e314f68bbbea2c048b4e664fc33a4/78641332127.pdfIn PDF document text
    • http://fine-trading-knotwork.de/uploads/media/54709943248.pdfIn PDF document text
    • http://teleinwestor.com/userfiles/file/92085731495.pdfIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn 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_off0000cb70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB70 11020 bytes
SHA-256: 1aa89e8bc1b70d6c393fcf793019accee19f8e5ec9ca887afee1473fe8e9ac15
font_01_sfnt_off0000e51d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE51D 17476 bytes
SHA-256: 1233ff1c87ed526982c0d26ea50398b010cce301f980e07d72cdd57c5083088c
font_02_sfnt_off000112cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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