Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bf228dc1dc18214…

MALICIOUS

PDF

80.4 KB Created: 2021-09-10 09:45:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5a78024d4d6f179ad37e65904802e135 SHA-1: a038a7de8f154a4b758cc5e21ea7bee15b86ff00 SHA-256: 1bf228dc1dc18214f00d595784964c4d2a92880885ec37b37f12b3e12ba66bab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or malware distribution attempt. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest the document's purpose is to lead users to external, potentially harmful, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://lexcochoralsoc.org/demo/lccs/beta/userfiles/files/wetox.pdf In PDF document text
    • http://fine-cottage.ru/userfiles/files/ruwapimivurawajegur.pdfIn PDF document text
    • http://murito.fr/ckfinder/userfiles/files/54846087589.pdfIn PDF document text
    • http://potlista.com/file/files/bofewago.pdfIn PDF document text
    • http://matras-devison.com/upload/file/magefetekopokisevenik.pdfIn PDF document text
    • http://rund-sro.cz/UserFiles/File/tudupa.pdfIn PDF document text
    • https://tourpon.kr/FileData/ckfinder/files/20210902_5746E67BB043C4A8.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/jopoxukukigipul.pdfIn PDF document text
    • http://www.kyousei-fukushi.or.jp/system/ckfinder/userfiles/files/64937666602.pdfIn PDF document text
    • http://dierenwinkelindex.nl/images/uploads/24578741010.pdfIn PDF document text
    • https://advik.net/userfiles/file/xuvewunawanuk.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/5378b98c2e4dbc019b534f2c95a2a029/garedonujas.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613acee8b462c---vefafamezuw.pdfIn PDF document text
    • https://kar360.com/resimler/files/novunom.pdfIn PDF document text
    • https://nezrenweb.com/calisma2/files/uploads/26184815810.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/nibopaveburozuv.pdfIn PDF document text
    • http://xaydunglenguyen.vn/upload/files/6055f5.pdfIn PDF document text
    • http://futureinfashion.com/ckfinder/userfiles/files/55364991629.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/6f181aec8be688492044b6e207822470/75029769864.pdfIn PDF document text
    • https://underworldgear.com/admin/images/fckImg/file/61750042477.pdfIn PDF document text
    • http://1night2daytour.com/ckupload/files/mebizujowafuvenevu.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/ff6e0906a824b363799fcd5b873adf6b/61089761340.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/fopinijat.pdfIn PDF document text
    • http://miraesusan.com/ckupload/files/52487471961.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613090306c0b9---bizuwokurunati.pdfIn PDF document text
    • https://spheresignal.com/app/webroot/userfiles/files/92941879159.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=scp+apk+downloadPDF link annotation
    • 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_off0000d669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD669 10172 bytes
SHA-256: baab66b36b702040a84ce91f3873dc93e1fc4825e4978893581bc00bc4fd7146
font_01_sfnt_off0000ed57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED57 18052 bytes
SHA-256: e1bb38acc28d1fb9234b066be5265e020463027820aaa2e0378984d77da78e2a
font_02_sfnt_off00011c28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1