Malicious PDF — malware analysis report

Static analysis result for SHA-256 2272df5e1da79323…

MALICIOUS

PDF

81.2 KB Created: 2021-09-16 01:11:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c799fd67fb674283b329145d73bd576d SHA-1: c52799d5ba595dfdeb679e14f4621191779c95b1 SHA-256: 2272df5e1da7932377ee6cf5c500d8dbd2cea999083a96ad825e5577bef6390c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs pointing to compromised WordPress sites and disposable hosting, forming a link farm. The document body is heavily obfuscated, but the presence of numerous external links suggests a redirection mechanism designed to lure users to malicious sites. The heuristic 'SE_QR_LURE' indicates the document may also instruct users to scan a QR code, further supporting a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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=can+i+connect+my+samsung+phone+to+my+ipad PDF link annotation
    • https://www.bakkersvlaanderen.be/resources/plugins/ckfinder/userfiles/0/files/64880868629.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161377e907bc17---96338466836.pdfIn PDF document text
    • https://uat-tunisia.com/userfiles/file/43652618811.pdfIn PDF document text
    • https://albawadiroad.com/userfiles/files/91691639459.pdfIn PDF document text
    • https://padservhosting.com/userfiles/file/vefevuxizizemitigav.pdfIn PDF document text
    • http://svadbavmoskve.com/content/xuploadimages/file/lopomomema.pdfIn PDF document text
    • http://infosierra.es/images/editor/74966648988.pdfIn PDF document text
    • https://rmp-familienanzeigen.de/cms/files/zaxazeneb.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f78c955640---natejegujenanas.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/59486229892.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/92052904114.pdfIn PDF document text
    • http://china-spec.ru/userfiles/file/pupupim.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16133793238d73---82405611864.pdfIn PDF document text
    • http://sweed-trans.eu/ckfinder/userfiles/files/zidoduxurodegefeg.pdfIn PDF document text
    • http://phucuongplus.com/upload/files/patorekujubukikuzunal.pdfIn PDF document text
    • http://ulrike-mayer.de/userfiles/files/nekamomum.pdfIn PDF document text
    • http://yugreat.com/filespath/files/20210902121125.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/8a0o2lc9l3h06ka5gpsmfab72p/woxid.pdfIn PDF document text
    • http://iehyun.com/editorupload/file/6492388412.pdfIn PDF document text
    • http://jyjjapan.jp/files/ckeditor/files/81439437123.pdfIn PDF document text
    • http://hangnhatbanonline.com/upload/files/52609105036.pdfIn PDF document text
    • http://jewelry-shopping-city.com/uploads/files/202109041648358617.pdfIn PDF document text
    • http://petrduchek.com/files/jujejepavilapuxum.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614091f86b682---pilom.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_off0000d7bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7BD 11060 bytes
SHA-256: 105340eb4c58073431b76aeea262198adb231c7b7320508ba4a586423c2c05ff
font_01_sfnt_off0000f132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF132 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10944 17984 bytes
SHA-256: c0d40def57085853f494e89c4cf791339acb405690ea88feffefe8520e94cad6

Open this report in the interactive analyzer, or submit your own file for analysis.