Malicious PDF — malware analysis report

Static analysis result for SHA-256 925f949d3da94abf…

MALICIOUS

PDF

85.8 KB Created: 2021-10-07 17:50:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: bba592783cb41201d3d7d49b83b63724 SHA-1: 96fa08395690a713836ac7b7f011ecd50806a7c5 SHA-256: 925f949d3da94abfc49cfee7df122cc1fd17735ebde8f93f71d6f10a40028c24
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing or malware distribution sites. The embedded JavaScript is a common technique for obfuscating malicious links or initiating further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://huntic.ru/uplcv?utm_term=pinoy+movie+torrenting+sites PDF link annotation
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/qdm37f8guv85ld7591grrq2gku/lejegoxujexanegorovon.pdfIn PDF document text
    • https://keluargamimpi2.com/contents/files/rijelivi.pdfIn PDF document text
    • http://autofactory-jin.com/js/upload/files/dulezakururatepukosek.pdfIn PDF document text
    • http://incomingmakedonia.com/files/files/24188187368.pdfIn PDF document text
    • http://buren-kompanie.de/userfiles/files/xuzojobedopozefidim.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/bujotovorisovebaral.pdfIn PDF document text
    • http://celyroknaterase.sk/editor_uploads/system/files/30132533617.pdfIn PDF document text
    • http://egyptlance.com/userfiles/file/jokotilakol.pdfIn PDF document text
    • https://www.kuwaitpolyurethane.com/ckfinder/userfiles/files/38743202672.pdfIn PDF document text
    • http://monterroso-construpuntos.com/campannas/file/peretidavowanajebarim.pdfIn PDF document text
    • http://ongxoanhdpe.vn/upload/files/3745716084.pdfIn PDF document text
    • http://suvagcentr.ru/userfiles/files/zimekadokem.pdfIn PDF document text
    • https://weekendtripskolkata.com/userfiles/file/limakoguzuko.pdfIn PDF document text
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/35328839581.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161420d6dac81c---53732802461.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/0e017124ac91eea8095f9f931d2376e0/74286245541.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/nibesowoxidul.pdfIn PDF document text
    • http://vet-arrighicolangelicristilli.eu/userfiles/files/86440218727.pdfIn PDF document text
    • http://www.oneworldkarate.com/fckeditorimages/userfiles/file/norejabutadamusu.pdfIn PDF document text
    • http://xn--bqrr0jw6bmw2g.com/userfiles/file/1632405285.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/d4kc8urgq2getq40jrpqbl04b0/nigosafifirefutizadi.pdfIn PDF document text
    • https://nucamsa.es/userfiles/files/liwanegomexitumenitolijo.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614933d443b8b---zopukuwoj.pdfIn PDF document text
    • https://allcondosales.rodeodrivecondosale.com/userfiles/files/vupuvasogibopixema.pdfIn PDF document text
    • http://gartenmessebau.de/uploads/files/jiwenatadomirowodepitijo.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_off0000e83e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE83E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10055 10424 bytes
SHA-256: 3d9cc1fcc2d15d55f42e1bd0860f3aeb24f48cffbb800f17f5e4de263228114c
font_02_sfnt_off000117f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F6 18996 bytes
SHA-256: 611cf5ab38cdf651bf049e9e4af3ee161ad0d0d3fd25ad98223c226ccfa8bdc7

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