Malicious PDF — malware analysis report

Static analysis result for SHA-256 b79eefce1d4f946d…

MALICIOUS

PDF

84.6 KB Created: 2021-08-26 04:11:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 576e4e03e3dbbe47961a08cbb2c65653 SHA-1: f698152d4c10d0e4fac39e716d3cd7eca624eca2 SHA-256: b79eefce1d4f946def3747b28fb7628e1a33f81e6441e781f1c2cb3c69c8c9b0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous external links, many pointing to compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious activity, likely serving as a gateway to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://cructi.ru/uplcv?utm_term=rising+inflection+examples PDF link annotation
    • https://dbjadow.pl/attachments/file/kofemukotaxo.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/160866a2885364---10521484432.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/83981192889.pdfIn PDF document text
    • http://ptichile.cl/userfiles/file/zepej.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/a0c401fe109e1af100ceb2ab798d04e0/pukuzaponujunurefasubu.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cad97210ad---47306788325.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1609c3b863b42b---44365107520.pdfIn PDF document text
    • https://rlmahtani.com/userfiles/files/zoxujevogefutodifozebebok.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/e75e21d6076cb10f46585a559aa4139a/japasusesutejar.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160a7619762342---59614163770.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/g95ajvu67qf3tfhf9gijhb4a2b/64875758414.pdfIn PDF document text
    • https://warungmimpishio.com/contents//files/ketoxokuj.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd7d786584---kebopabufez.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/ralawatigameliz.pdfIn PDF document text
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/52305753961.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5831f3a6a---36409680937.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/40935f107ccfc299511de6e025b50af8/zidowanulosediroliraxu.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/620c2e533ac70b7261bd46d26296259b/subikezako.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/60844667399.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/35273224724.pdfIn PDF document text
    • http://magnachip.cn/userfiles/file/20210512180632.pdfIn PDF document text
    • http://agendaalzheimer.org/files/galeria/files/wezabig.pdfIn PDF document text
    • http://jonkmp.nl/img/cms/file/45425241369.pdfIn PDF document text
    • http://exlluprimebrochure.com/ckupload/files/gumox.pdfIn PDF document text
    • https://breedlife.com/upload/files/xufebiwupak.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_off0000e563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE563 17516 bytes
SHA-256: 47f355b3f4e37db8a1b2f1c3adf00ee4c1c7567d52d367d91053782981d0e4f5
font_01_sfnt_off00011321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11321 10868 bytes
SHA-256: 710b6f406658b9d90f38f12359e136fdd02939e48f4c9077123c276f10ac8a41
font_02_sfnt_off00012c4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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