Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c74f90aa11006e9…

MALICIOUS

PDF

107.7 KB Created: 2021-07-07 17:19:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ef147852a5d3a49796bc56cb7ed6c032 SHA-1: 73de18afcea736b745b8a9340b0a7cd66f450ec7 SHA-256: 4c74f90aa11006e95a0e1a08d62b68428b56a1435dd2321e2991dad7f7f792d2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://allytemp.ru/uplcv?utm_term=armie+hammer+and+timothee+chalamet PDF link annotation
    • https://senhewood.com/d/files/zekaji.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607e39b9d3a57---timibupifixumozefatus.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160795e66bad91---74041707618.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc3b5b58062---13002433054.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f871ab308---dafuxikorugozilototi.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/1b4489b3e72a2ee7f3c293e5280214eb/susupoze.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/8986634923.pdfIn PDF document text
    • https://activepymes.com/pub/file/vofuripifekat.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/e506h69i3each4dqg0rprshgnk/mivapejavezedudo.pdfIn PDF document text
    • https://tuttoadomiciliocn.it/file/6614180058.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/012548beac540bdb161186010666fcc3/denagokip.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/59840488651.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/tepurokamubunasijivofo.pdfIn PDF document text
    • http://nandeestationery.com/userfiles/files/rifonivupekiwevofanoratit.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/52494904368.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/30e56e938424362f667d9d419444bebd/65078788939.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160925e47d2505---79545287822.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/fb71ab6dd5470706aaefef21f6fa8a2d/41127888799.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/40910645452.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/fabosomatazulimojewizad.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c924a3115e4---jovaji.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160795dd872bd5---20085868284.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/jovemi.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609f01e769a70---samoterivuzazozoj.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0a53ee084---bobajoruv.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14204 18140 bytes
SHA-256: 49037f1a6bab136d5477f1f8b58e89c1b271a8a7f0322e56c216a8a37b4822cb
font_01_sfnt_off00017166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17166 10448 bytes
SHA-256: 9142b531f5641b5794883b606d72bd8d867f00c5125d05b07f9433bab38fca11
font_02_sfnt_off000188e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x188E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1