Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d37a9ae2f79865e…

MALICIOUS

PDF

81.7 KB Created: 2021-09-19 08:48:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8ee5e955249fb343d5cfe69e6db49162 SHA-1: d23f6ee3a5ffa469d380b75d12120b8fec609003 SHA-256: 0d37a9ae2f79865e0d824425dbe8aaa756950c7bd6b9a53ab511c48bb5673efe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The heuristics indicate the PDF functions as a link farm, directing users to compromised CMS upload storage and disposable hosting sites. While no scripts were explicitly extracted, the nature of PDF link farms often involves JavaScript to facilitate redirection, hence the inclusion of T1059.007. The primary attack pattern is likely phishing or malware distribution via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kvizek.hu/ckfinder/userfiles/files/lezisawuzo.pdf In PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613295af34c58---58036555701.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c519b2070f---vofokuwarititawoxuzate.pdfIn PDF document text
    • https://softwebstar.com/shop/userfiles/file/87166460584.pdfIn PDF document text
    • https://www.loisirs-auto-occasion.fr/ckfinder/userfiles/files/51001951669.pdfIn PDF document text
    • https://kaplaitalia.it/userfiles/files/7304417442.pdfIn PDF document text
    • https://francois-daulte.com/ckfinder/userfiles/files/fesajaninofanugujaxom.pdfIn PDF document text
    • https://pfollowers.com/ci/userfiles/files/10652204701.pdfIn PDF document text
    • https://ripedzn.com/app/webroot/files/fckeditor/file/40397619704.pdfIn PDF document text
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/bekujolopimasum.pdfIn PDF document text
    • https://iringmalaysia.com/ckfinder/userfiles/files/39597621146.pdfIn PDF document text
    • http://medtravel.pro/images/hand_uploaded/files/45681154974.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed6ccb601e---nubefakupidiw.pdfIn PDF document text
    • http://vps73.juicy-group.com/editor_upload_image/file/tiguvamidige.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/sitisiwowivunofalagaxesi.pdfIn PDF document text
    • https://noventa.cz/media/files/file/porufosud.pdfIn PDF document text
    • http://srcchaika.ru/files/uploads/files/jagosexibirulatojoguvux.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/161310d94f00b3---50517914273.pdfIn PDF document text
    • http://studiorestagno.eu/userfiles/files/3849649230.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/ladom.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/161413f2fe11f6---55122949951.pdfIn PDF document text
    • https://kcss.hu/korosi/userfiles/file/lureloredigobulekujo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c02fa943d4---kuxewadozevivedirolig.pdfIn PDF document text
    • http://renknh.com/ckupload/files/nijizexeruwajuvufiwumimu.pdfIn PDF document text
    • https://zerling.eu/nico/images/files/84232891349.pdfIn PDF document text
    • https://infotechb2blite.com/bot/ckfinder/uf/files/visifidi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=things+to+do+on+echo+show+8PDF 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_off0000d98f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD98F 10596 bytes
SHA-256: 40b583c5724dda4eb1b2b001472ba351bedabd317f2f7e7f0146a4fbee9b100a
font_01_sfnt_off0000f190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF190 18144 bytes
SHA-256: 40e70a14c0c8ca45f5ec4acf09e67df77f7109d7299a481f818204151c3c9eb9
font_02_sfnt_off000120ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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