Malicious PDF — malware analysis report

Static analysis result for SHA-256 0724806404c00ef6…

MALICIOUS

PDF

84.7 KB Created: 2021-09-17 12:07:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 500ce9ad352f20f1ad4d03ce8213671b SHA-1: ac918babaea2ca77b84f0852a17991465d331a59 SHA-256: 0724806404c00ef69c7716a2fd4b7537022aca633648529911fd2d24fc067ce5
156 Risk Score

Malware Insights

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

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to potentially compromised or disposable hosting. The presence of multiple PDF link farm indicators suggests an attempt to obscure the final destination and potentially distribute malware or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://robertwestlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pefatibowujiwimelibebun.pdf In PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141d87c4d2b4---31790771114.pdfIn PDF document text
    • http://artsar.pl/userfiles/file/pilofukexuxiwosofetoza.pdfIn PDF document text
    • http://elai.kz/upload/2021/09files/2109120811125801295h6ln.pdfIn PDF document text
    • http://express-service-auto.fr/ckeditor/ckfinder/userfiles/files/ninupilezobasasemekiwo.pdfIn PDF document text
    • http://www.beverburcht.nl/upload/files/42980539202.pdfIn PDF document text
    • http://bookblog.kr/data/file/files/pubodenepe.pdfIn PDF document text
    • https://nieruchomoscikomercyjne.co/files/file/73954779680.pdfIn PDF document text
    • http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/fafariduxalosujiwoxula.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/80431856361.pdfIn PDF document text
    • https://letstravelforacause.com/miet/assets/files/katiteneziriwuludelexu.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161414f724cc12---fujafugowelemariruz.pdfIn PDF document text
    • http://reckdance.pl/userfiles/file/sobufozatuloro.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135dc632c8e9---gaxegogapog.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/54442788961.pdfIn PDF document text
    • https://ruta.hu/ckfinder/userfiles/files/32170803397.pdfIn PDF document text
    • https://ku4ysk-9lgp4y.com/contents/files/pavaz.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/rinofoxofotefapox.pdfIn PDF document text
    • https://pakistanchristiancongress.org/userfiles/file/34357666188.pdfIn PDF document text
    • http://fusen-es.info/yamituki-n/uploads/files/vewugiduzeramiwonix.pdfIn PDF document text
    • https://mlspoland.co/files/file/depisarizejol.pdfIn PDF document text
    • http://lovepetclinics.com/file_media/file_image/file/xonukunutabiroged.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/nasig.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/wegom.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614439774d182---rikeferexebuguvos.pdfIn PDF document text
    • https://dintek.eu/uploads/file/12838988348.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=real+ghost+detector+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_off0000e34f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE34F 10924 bytes
SHA-256: 11eee293e3209c193b603d066d8c52914461ae71bbcacaa5920fd1697d474ed8
font_01_sfnt_off0000fc7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC7D 18384 bytes
SHA-256: 345b07371772a2260c0621f9127ab69b58b5f9ef0d3c30c814ed8fa52fe6ec7a
font_02_sfnt_off00012c6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1