Malicious PDF — malware analysis report

Static analysis result for SHA-256 f64cfe7079d29846…

MALICIOUS

PDF

69.5 KB Created: 2021-09-24 16:37:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4e1e1f97f9017f2dedb79499f56433f8 SHA-1: 1685beddc509fda4dfe3b039502ec404533cee2d SHA-256: f64cfe7079d2984616dca3019fd3a938e234e3ce0a823248f13ac708edaf0d74
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code or redirecting users. The presence of numerous external URLs, many pointing to compromised CMS upload storage or disposable hosting, strongly suggests a phishing or malware distribution campaign. The ML classifier and ClamAV detection further corroborate the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://nomylo.ru/uplcv?utm_term=drag+racing+free+download+for+android PDF link annotation
    • http://stefani.cz/fck/file/23367275752.pdfIn PDF document text
    • https://ivanamihic.com/files/vimulolomu.pdfIn PDF document text
    • https://refakatci.net/userfiles/file/rubuguwanujuzejem.pdfIn PDF document text
    • http://vodnik48.ru/content/file/88433293750.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee50363141---67509421812.pdfIn PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/42367418525.pdfIn PDF document text
    • http://www.pataniforum.com/admin/jquery/ckfinder/userfiles/files/55720022834.pdfIn PDF document text
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/zodeletufajel.pdfIn PDF document text
    • http://beijingteye.com/upload/files/sidubufebiker.pdfIn PDF document text
    • http://webspace.mysdam.net/images/newsletter/files/radiniliwasawofevotipukej.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16131335b10acd---wosepa.pdfIn PDF document text
    • https://jdrum-music.com/uploads/ckfiles/files/925719034.pdfIn PDF document text
    • http://tulga.ru/editor/files/63451500822.pdfIn PDF document text
    • https://totalsewa.com/userfiles/file/28957328266.pdfIn PDF document text
    • http://drentmedischadvies.nl/uploads/files/fasodoxuvas.pdfIn PDF document text
    • https://fasleh.net/Files/files/43193213654.pdfIn PDF document text
    • https://bc2000.order-pro.com/ckfinder/userfiles/files/11484109124.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614c07e8049f6---sijodedinevojoj.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/afd896b573b0c44603615fb2582f81f9/12086919897.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/54265622249.pdfIn PDF document text
    • http://drukarnia-skawina.pl/app/webroot/media/files/80956313320.pdfIn PDF document text
    • http://ledspectrumthai.com/ckfinder/userfiles/files/70900337511.pdfIn PDF document text
    • http://www.portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/junosud.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/79705045932.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_off0000b01b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB01B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c832.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC832 10472 bytes
SHA-256: 627908b95cb38c150a8ea1b93314483fc8ff5a8369116bdf7d73059db9f20ba4
font_02_sfnt_off0000dfeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFEB 16160 bytes
SHA-256: fe0850a9428a47de38e4b91f1f8bc3001ca7a3e2baf5ba1f75a2902bba2e4e06

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