Malicious PDF — malware analysis report

Static analysis result for SHA-256 5500d61044014725…

MALICIOUS

PDF

81.0 KB Created: 2021-07-23 06:21:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 941db2f13af838a2f1bb6c133702e15f SHA-1: 5822f058ee2f1a5335885c046fc428e8d77b5b7a SHA-256: 5500d6104401472511cff5843d7757831eee084e32109bc00315c39123da27a7
156 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many hosted on disposable domains or compromised CMS upload storage, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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 http://zs-oilfieldequip.ru/d/files/gasebewogesogegasenabupaj.pdf In PDF document text
    • http://eot.mn/uploads/userfiles/files/97050338972.pdfIn PDF document text
    • http://fence-alarm.com/userfiles/files/sakabidomuzi.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/38768732917.pdfIn PDF document text
    • http://seamcc.com/UserFiles/files/dudatejelesuxusi.pdfIn PDF document text
    • http://creaorganization.com/depo/sayfaresim/file/wipurabafowatupinovo.pdfIn PDF document text
    • http://implantologie-deva.ro/app/webroot/files/userfiles/files/1016254710.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/d15543215ef0c57a74cb3983c2fcb21a/lunibepewewedajitubalopux.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a9cfe3a9453---kekoxutezapovi.pdfIn PDF document text
    • http://erodiertechnik-wenzel.de/userfiles/file/silitijutimadavugudimale.pdfIn PDF document text
    • http://stpatricksreunion.com/clients/84553/File/gekinomojefavadefafolabu.pdfIn PDF document text
    • https://mps-india.com/userfiles/files/59316175738.pdfIn PDF document text
    • http://brianhaymore.com/images/e/file/vobadowekebudabe.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/nefojazexafuliloterivutat.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607c751541023---35692890411.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/8f6ce089709f357e4fedbbe6f6adefdd/sajomefokuku.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/70150af51b49644d5656ea772f080cea/zumutezevazonawazizo.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2c69abdb0---9743499324.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609199670d223---4058365641.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/webasasas.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160789ce05be2e---67290579311.pdfIn PDF document text
    • https://masini-de-ambalat.ro/images/userfiles/watovupeponumi.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/erluncfiv38jfdncuorsa33men/fobudumelelun.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea5b0aa966---97724013421.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/1u152se707oq68a79ps5g7vq26/3721707881.pdfIn PDF document text
    • http://aquatherm-graz.at/files/96606757367.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=excellence+in+researchPDF 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_off0000d9d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D6 17080 bytes
SHA-256: ee72d8a5b0aa40ffb7267f2b465dc1ee3bb972dc7a05fc706a412c7459fd317a
font_01_sfnt_off00010638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10638 10192 bytes
SHA-256: 6d773a4b132772f93263543425b1cc1e0518c1a086751ebfc27cb16567ccdfcb
font_02_sfnt_off00011cf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1