Malicious PDF — malware analysis report

Static analysis result for SHA-256 22ba03f4ebc2812f…

MALICIOUS

PDF

77.9 KB Created: 2021-09-09 23:55:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e7fb7429cdcd8e4a3028c89f318e2986 SHA-1: 9b81ca885fd1d7402c44f924c094bcaa3ff69cc9 SHA-256: 22ba03f4ebc2812f493f3248573ce6b5dc46513b2b8b4f0dc91c1955d077c69c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. The presence of embedded JavaScript and numerous external URIs, many pointing to compromised WordPress upload directories or disposable hosting, strongly suggests a phishing or malware distribution attempt. The document's structure as a link farm, combined with the embedded JavaScript, indicates it is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://smidgel.ru/uplcv?utm_term=telegram+media+player+for+android PDF link annotation
    • http://savalis.ru/userfiles/file/luzapabozosagaw.pdfIn PDF document text
    • http://modellszerviz.hu/userfiles/file/lewexita.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/a8cd9e2057366be36295861898e7a459/najaverowewubolifax.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138518fe9dcb---ladudobuxo.pdfIn PDF document text
    • http://daieimotors.com/js/upload/files/tovakipewivi.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/rikovilenilipifosa.pdfIn PDF document text
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/bejuvujidijafokude.pdfIn PDF document text
    • http://itineraire-consulting.com/ckfinder/userfiles/files/83592686979.pdfIn PDF document text
    • https://blv.by/upload/editor/files/zatibemofovuveli.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/17348718208.pdfIn PDF document text
    • https://fishboat.hr/files/87044190776.pdfIn PDF document text
    • http://wu-pao.com/upfiles/editor/files/22361284588.pdfIn PDF document text
    • http://phupmirpol.pl/userfiles/file/zinoforilarizodi.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/161335904c8ad7---54827935440.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/23908255578.pdfIn PDF document text
    • http://aprt1day.ru/file/40466068426.pdfIn PDF document text
    • http://meyergarden.com/ckfinder/userfiles/files/bufomudigosejidabaxafusus.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130d3dd7145a---fixoxaravapes.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613313eaa8f82---kexivomitisawapeseki.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/jlvkt67ukl8sspdf2s4bj7o1c9/43479946054.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/gazamoxuzikipetu.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/63334351509.pdfIn PDF document text
    • https://treasurehunterdetectors.com/ckfinder/userfiles/files/tepajovuzumusenigadige.pdfIn PDF document text
    • http://jingmingtai.com/filespath/files/20210908143029.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_off0000ce06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE06 16704 bytes
SHA-256: 4f8b6172ef8cb1b2a44ad8c6da5237a92cdb8e5fcfff56fe53330e6caaea11e6
font_01_sfnt_off0000f950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF950 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11167 10652 bytes
SHA-256: c63652521a417c5f4cbaeb937dc8519ed261ecf5423a5b92ac013d42c3776f9b

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