Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fa224d745a78c55…

MALICIOUS

PDF

69.1 KB Created: 2021-10-01 09:59:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 01982bac8d54ca3aacaeb313117436c0 SHA-1: caf7bf6b7f89457de343d45b59ad6d5aec90e7f3 SHA-256: 3fa224d745a78c55ac40b9355262a12323220afcb7cd932bec68ef18899bb2f8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://pixomot.ru/uplcv?utm_term=xperia+5+ii+wallpapers PDF link annotation
    • http://svadbavmoskve.com/content/xuploadimages/file/64219549986.pdfIn PDF document text
    • https://sino-islam.com/upload/file/211532145558.pdfIn PDF document text
    • http://nikolabartakova.cz/files/file/wunivebosujitizufidirap.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/140d2b6e8cd6aef1f819b0174a9a0cae/97044419646.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/leninazotusafeponexoz.pdfIn PDF document text
    • http://www.themixchange.com/userfiles/files/94107551987.pdfIn PDF document text
    • https://www.bbmnetlicitacoes.com.br/cms/ckfinder/upload/files/18158791283.pdfIn PDF document text
    • http://masterkontroll.hu/ckfinder/userfiles/files/8350919010.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/28e38e78baa7850d29795489f72a5b87/zesokobewoxamizeziribav.pdfIn PDF document text
    • https://lemarko.com/userfiles/file/30396590192.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/161343f6b56085---bafunuselovizenogewuge.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/kusitofidesatenora.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/54849727388.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614d6b6a4efe6---18158241895.pdfIn PDF document text
    • http://posuni.com/userfiles/file/mozuwobek.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16152fa680eb21---39819401456.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/13518763460.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/22645788410.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/50647314946.pdfIn PDF document text
    • http://soosanfix.com/upload/fckeditor/file/76947617893.pdfIn PDF document text
    • https://greenways.at/userfiles/file/16917041449.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161532ff8dc02b---26059646729.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/7693304200.pdfIn PDF document text
    • http://www.siphonicflowmandiri.com/upload/files/90626883719.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_off0000b049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB049 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c85b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC85B 15704 bytes
SHA-256: 591d0bbeb95af9074079bf37fd3c3fae769ec79c478e32e261205308e19d4ba2
font_02_sfnt_off0000f075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF075 10152 bytes
SHA-256: 237a7a28f04075b6df4eee67e05824d5f19fde19bc301a96d2fc56c46a650701

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