Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff410918e4e4b851…

MALICIOUS

PDF

89.2 KB Created: 2021-07-31 20:08:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7cf350924b1578360bd65980ca84f376 SHA-1: 1227187262cc09646f8f8e36487a3bafc7a06405 SHA-256: ff410918e4e4b8516a090c17d3dbff6bb0d58f5015e69362451c5c51bbeb7f42
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, characteristic of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO abuse. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 https://serviceservice.eu/userfiles/file/fenugotalojelulubujopumip.pdf
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/10736557192.pdf
    • https://couvreur-hautdoubs.fr/internet_new/images_et_fichiers//file/mekopumasisosusifitujenu.pdf
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/bfedeqqb4pogknof80dgc70367/bazojevaluvuremirawujoz.pdf
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/13059760758.pdf
    • https://office-agglo-larochelle.fr/userfiles/file/49936182316.pdf
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/nlpj3l61k4im10lnv7ijonfiq7/70299437816.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160908db473ccd---13268042895.pdf
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1607b74d051c3f---56175283661.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a6b6a5959---videdobebujowide.pdf
    • https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/zugiwogojukotinagediz.pdf
    • http://magooferta.pl/uploads/fck/file/zufiratinu.pdf
    • http://jsushibrea.com/uploads/files/33313675583.pdf
    • https://tigapilar.com/upload/files/zesuzi.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/7e5d580d8049219981b6d3e5f674d961/damevigasobemep.pdf
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/71pg9j2n9e2k42s5u95vk3tcl0/23323713733.pdf
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/92964269803.pdf
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/62442290429.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/h93ke7p5dm0q3afniiiuut1la7/pulasipizelodomapetifi.pdf
    • http://thibangoto.com/app/webroot/uploads/files/supajuvo.pdf
    • http://atek-ent.com/upload/file/64954224848.pdf
    • http://domplus.su/userfiles/files/rumus.pdf
    • http://infinity-pro.ru/userfiles/file/womiburajukawesav.pdf
    • http://china-hold.com/UploadFile/file/20210612084827335.pdf
    • http://malagi.pl/user-files/fck/file/12356540080.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=defining+and+non+defining+relative+clauses+activities+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f813.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF813 16792 bytes
font_01_sfnt_off00011025.bin
55a7c1c61588c03585a190e280c24f83ac94e85c5e737e005705c6876e02bdf3
pdf-font-stream PDF embedded font (sfnt) at offset 0x11025 16800 bytes
font_02_sfnt_off00013bb5.bin
dbcad35caec663e03f7dea17314b06a383fc3fb101597204ef18e553b7037833
pdf-font-stream PDF embedded font (sfnt) at offset 0x13BB5 10960 bytes