Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e0c8c9d090c875a…

MALICIOUS

PDF

79.6 KB Created: 2021-06-12 23:34:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 7e0b0afe19ab422b02e6c652b0996814 SHA-1: 9f1b271272722c8a5ea13ec4ad1c40f5a611967d SHA-256: 1e0c8c9d090c875ac8d72af9bea3634775ebe83190fa2f9bc2e476184082dbbd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm or phishing lure. The presence of 'utm_term=minecraft+modded+servers+free' in one URL indicates an attempt to attract users interested in gaming, likely as a pretext for malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://inwebjor.ru/uplcv?utm_term=minecraft+modded+servers+free PDF link annotation
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/16086a9edc8a15---jozatabalupe.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/79a36ecbc19a392041fbd1ffb6074ebd/49369078416.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1e2b38e5f---18463755431.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/zosijelojusakumaponu.pdfIn PDF document text
    • https://discoverthesky.it/file/18826469078.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/8578423230.pdfIn PDF document text
    • http://kzlo.pl/fotki/fotki/file/52594755968.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/leropi.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d0171739a8---nokofazodobisobudavowig.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/34ed56a7cffe5f9a06c2252cd9270d01/39422334993.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd6995d02c---jegexegevifod.pdfIn PDF document text
    • https://mfdesign.hu/files/file/93309589329.pdfIn PDF document text
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f48e60fb32---nekufibovufigokejebaz.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae0f1a9b74---31271968710.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160742e0a3937f---24869616529.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/esujnun923l6pgfi68edqt8pfk/40878559617.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7D 5200 bytes
SHA-256: 26d4c0b67945fc6f7a4036790fb0c6873c4cb6b2cfe91bdf532375f2c91e7738
font_01_sfnt_off00010c2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C2C 11132 bytes
SHA-256: c130a10f4bb134e921417f0982121bd771583d11440e3df7a45357119bd30d6b