Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f4e74987aa34309…

MALICIOUS

PDF

83.4 KB Created: 2021-09-04 12:02:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3d7e636f2c0b332adaf4d75fc73659a5 SHA-1: 92bed62c6b4847e6caed3209a577092744283882 SHA-256: 1f4e74987aa343094b2378a229a9ff4ad8e55758d456ed4e048d8eca416f3aff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, with numerous embedded URLs pointing to various domains, some of which appear to be compromised CMS uploads. The primary purpose seems to be directing users to external, potentially malicious content through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/412e89b3bdc7c1807a8a174519fda76c/dejirubuzegeboloba.pdf In PDF document text
    • http://trongtinpc.com/luutru/files/58132449741.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/9648329338.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/27077231754.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa5c3a292e---33345961513.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161261139e504d---zatogipabuko.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/62447971169.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075db26eae3b---salenopekeloturimaxepan.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/a7906d52780f6abbb3390a103caec7be/malonalunobovemat.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/24681137778.pdfIn PDF document text
    • https://parkettworld.com/upload/files/romapenexidete.pdfIn PDF document text
    • https://langumeistras.lt/i/File/wamugupaleruvoliruf.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/jofapewe.pdfIn PDF document text
    • http://leeandrewdavison.com/download/xikubo.pdfIn PDF document text
    • http://itssilvertime.com/clients/2/24/24efe347a73a8ce028152bf895bc11a7/File/firiwopidewilujobalowov.pdfIn PDF document text
    • https://aathichudi.org/userfiles/file/sonego.pdfIn PDF document text
    • http://www.pics4us.de/userfiles/file/88781534484.pdfIn PDF document text
    • http://sinners-party.de/media/file/69882894359.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/dufepelugaburuwakisijixam.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/79450517832.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/hrstuoteqlhlrvi7roj3a3f098/67621258485.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/161011d5abc8a0---gujet.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16094ffc33aa30---23484049656.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b05696e8302---86968163389.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=mit+6.00+introduction+to+computer+science+and+programming+pdfPDF 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_off0000dd7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD7A 18392 bytes
SHA-256: 2500690d2e18250ab4205e7da6e3abf4343a1d7381b6751b4ab8b0b3fdc326d3
font_01_sfnt_off00010cee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CEE 11364 bytes
SHA-256: ebef3ef7d39c7fa83f3ea0ecfb81d1446008b013d58bf9ef39c056768d752523
font_02_sfnt_off00012782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12782 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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