Malicious PDF — malware analysis report

Static analysis result for SHA-256 203ad66924736dc9…

MALICIOUS

PDF

82.7 KB Created: 2021-09-01 05:56:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 22cb0260ed36180674b4f13fae0fae5d SHA-1: ed3b7bb4d0ff53930ab0f03553f7f1b2980bbf5c SHA-256: 203ad66924736dc9330347b271e3a74e54c003492f0089d10721121293567e73
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as a link farm, with many embedded URLs pointing to potentially compromised WordPress sites. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The document's purpose appears to be directing users to external sites, likely for phishing or malware distribution, leveraging a technique similar to spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://medvor.ru/uplcv?utm_term=does+extra+virgin+olive+oil+clog+pores PDF link annotation
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a98982ce08d---vagovonijotizatinaki.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16092da90c7ac6---kezoxitage.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/janofurejizuvekumivu.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099d6999512b---kadazitek.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160740127be961---89470367690.pdfIn PDF document text
    • http://gustosandvic.com/ckfinder/userfiles/files/4800993317.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/velubodazub.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ccc0fb37641---kaxixiwulazaj.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612c850f6e08d---faxikenezu.pdfIn PDF document text
    • http://izumrud38.com/ckfinder/userfiles/files/nofepejewodaropuzewov.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d4cf44f32e4---11650739035.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/98486833729.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/bekepipifokadime.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/l8crbqqacr9l87l6eefqlhhne7/98985925609.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7b2d515d05843043b832a52a7d86de2a/26654823204.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/84604a9c46fbc0d48a8d9b5a9f13f5a2/nakaxetosogu.pdfIn PDF document text
    • https://lensmam.com/userfiles/file/vovisejidewarelogud.pdfIn PDF document text
    • http://jfe.hk/userfiles/61804652021.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/54131981972.pdfIn PDF document text
    • https://traicaygiasi.com/Images_upload/files/97848025303.pdfIn PDF document text
    • http://reklama-kemerovo.ru/files/files/77940939021.pdfIn PDF document text
    • http://abakus-routing.co.uk/ckfinder/userfiles/files/ligawodoloxobinor.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/feduvi.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/43573220645.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_off0000dfbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBB 10716 bytes
SHA-256: ea16414b41c0439c7a541e6908e564fb46d1f86852b99ef9e9f517e154b5747e
font_01_sfnt_off0000f888.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF888 16976 bytes
SHA-256: 27e5dd03eed22f4d2d23bbade162713b0fe1459053d432b123cd6325e383549b
font_02_sfnt_off000124de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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