Malicious PDF — malware analysis report

Static analysis result for SHA-256 804af15e9042a184…

MALICIOUS

PDF

80.2 KB Created: 2021-09-10 17:04:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e546a6781de34ec69a301a977546d6c6 SHA-1: 7ac1ad47821ed84a9d570a25b99d49ae7412825c SHA-256: 804af15e9042a184c9414af90f612046561de38df23e036cc15e1c5b8717a2f4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://crewmak.ru/uplcv?utm_term=cloud+tv+ott+apk PDF link annotation
    • https://adian.eus/files/galeria/files/nogewunatiripewa.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/29120948115.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613737ed0f7e4---gamarano.pdfIn PDF document text
    • http://namhungholdings.com/uploads/ckfinder/files/76112425076.pdfIn PDF document text
    • http://talentfuturesservices.com/sharpinstitute/images/files/1046804942.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/66561795747.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/15218612025.pdfIn PDF document text
    • http://minerva-collection.net/files/files/weladifepafozur.pdfIn PDF document text
    • http://mywayrtk.org/userfiles/file/67383379619.pdfIn PDF document text
    • http://www.gobarging.com/uploads/textareas/file/nesitebuw.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136bbb42715e---41258939695.pdfIn PDF document text
    • http://lohoithaiduong.com/uploads/files/19145317832.pdfIn PDF document text
    • http://noithattamphuong.com/upload/files/6726481930.pdfIn PDF document text
    • http://nemalipics.com/81901163580.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161373cdf2cc4c---46543246413.pdfIn PDF document text
    • http://intertermo.nl/userfiles/file/widifobepuzi.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/vowixupalikozukubimo.pdfIn PDF document text
    • https://cafesca.info/ckfinder/userfiles/files/92098485998.pdfIn PDF document text
    • http://tindangnhadat.vn/upload/files/fubavujabu.pdfIn PDF document text
    • http://ues-rb.ru/themes/ues-rb.ru/files/4383138694.pdfIn PDF document text
    • http://netflor.pl/upload/File/63942144896.pdfIn PDF document text
    • http://wine-paraphernalia.com/files/winep/_repo/file/16042996474.pdfIn PDF document text
    • https://morabia.fi/images/file/8941892816.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/tobilebuxiworutaviledo.pdfIn PDF document text
    • http://caycanh.vn/images/fck/file/55990665525.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_off0000d066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD066 19776 bytes
SHA-256: 419866b86229790dbb3566f7792cec28ebc5ba0af687e69d24736ddaa82e4d97
font_01_sfnt_off00010409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10409 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C20 10080 bytes
SHA-256: 069eead833d512f1257009bf904109d15342de9cf073aee158ec8120f2346908