Malicious PDF — malware analysis report

Static analysis result for SHA-256 e30053e46723c170…

MALICIOUS

PDF

81.2 KB Created: 2021-09-16 03:18:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7cfdee5c1db857f22b60794f2f20bd07 SHA-1: 1367e582cfd6eca8a9747db35c799480e5f27a5c SHA-256: e30053e46723c17074d21de9fbdcbc0a30d860756404fd7f37365891f7a298d5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The heuristic 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' specifically highlights the use of compromised WordPress upload storage, reinforcing the malicious nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://domoticasociale.it/immaginiNewsletter/file/60248099274.pdf In PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109040252513417.pdfIn PDF document text
    • https://safetypadlocks.eu/eurostyl/photos/file/vawelosegatew.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/88963452819.pdfIn PDF document text
    • http://studiogiamberardino.it/userfiles/files/kegosajolanafa.pdfIn PDF document text
    • https://pragatitic.org/ckfinder/userfiles/files/feriwubogubixuniser.pdfIn PDF document text
    • http://france-ex.com/images/blog/file/31252177428.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161376383ddc47---92110721907.pdfIn PDF document text
    • http://cukorbetegshop.hu/files/genukerenukoxevupirom.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/fuxilolidatuvafolixik.pdfIn PDF document text
    • http://www.workbythai.com/admin/assets/images/paxelidolil.pdfIn PDF document text
    • https://tainandentist.com/uploads/files/202109090749008663.pdfIn PDF document text
    • https://mamadona.ru/ckfinder/userfiles/files/89601988053.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5bd9abe52---gogadepazaveru.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614278de997a9---45712628831.pdfIn PDF document text
    • http://efcosmetic.com/uploadfile/files/jixopolozusakesakebid.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/ruzeramafulirikuxegivowul.pdfIn PDF document text
    • http://partnercable.hu/files/68422018263.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140e815a8404---47247123704.pdfIn PDF document text
    • https://penzion-pod-rozhlednou.cz/img/file/39050632829.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133f4e456a18---vigonanit.pdfIn PDF document text
    • http://avtosfera28.ru/userfiles/file/fadidenupemuwip.pdfIn PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/tabuxoxusuvalurug.pdfIn PDF document text
    • http://matchedtubes.de/userfiles/file/87898460467.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/87523176421.pdfIn PDF document text
    • http://bharatdarshan.net/rgroup/ckfinder/userfiles/files/winaxar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=saints+row+app+for+androidPDF 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_off0000d9cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9CB 10476 bytes
SHA-256: 4d605b91c2538fa20987332487a3a0c2820ee027bc8bb9b7c5451d2e4303703c
font_01_sfnt_off0000f1b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B8 17632 bytes
SHA-256: 513a141f5218d54af508af27a4635fcab4aae4a233fa9a17c0065bcf106865a9
font_02_sfnt_off00011f80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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