Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fc8117176eff5a8…

MALICIOUS

PDF

87.3 KB Created: 2021-08-17 15:43:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b7757398bfa90015ebdeca3d62329886 SHA-1: 94847a771e63d3d52e63e4c723585c6d229373e4 SHA-256: 1fc8117176eff5a853d13d93988711a946bd2609bf059667182166f7bbb182d0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier. It contains numerous embedded URLs that point to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of external URI heuristics and link farm indicators further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://allytemp.ru/uplcv?utm_term=ba5301+international+business+management+notes+pdf PDF link annotation
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094e5e412df1---55942135776.pdfIn PDF document text
    • http://maxbrio.kr/files/files/ripedenotofametoluwigasa.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/a88ffccb732fb53a2396897cacf7453d/zumezub.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a224940d1d9---gadivek.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ae922a902c5---51262075933.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160878ad13f3fb---36589668723.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/8069200184.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fd9adc9628f---tumogo.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/97qm0vgtuvbemdqqijpdff1v3n/nagut.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/47665630861.pdfIn PDF document text
    • http://prestopc.it/upload/file/95290463253.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/92750792920.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/22400165442.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/32bcf608a9537b6bf0d90540a3cb7267/45700563787.pdfIn PDF document text
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d69ab6af91---95822226207.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/nudop.pdfIn PDF document text
    • http://nhasachnguyenvancu.com/Images_upload/files/nitilunezunixibotixam.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/nenoxuburawojesujemik.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074842049721---14612492835.pdfIn PDF document text
    • http://pillshop.ru/uimg/files/fajewodevasetolaxovuxi.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f4fcb6aa9---vimakakixov.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/3b19103cda1c23f29e0f866d40d3ae71/xowifevibit.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f93339dca---wugovutogoposofogunad.pdfIn PDF document text
    • http://anandamsanyal.com/userfiles/file/42460069338.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_off0000ef59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF59 16936 bytes
SHA-256: aeaa246135883113990278690609d9b63e77bbec387044e02b0bb40b941e995c
font_01_sfnt_off00011b75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001338c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1338C 11612 bytes
SHA-256: d5e5ae54cb8e501d5f7d1b11186d6346e7c8993d713151ff420550788b89d537

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