Malicious PDF — malware analysis report

Static analysis result for SHA-256 805e7f65affd56c7…

MALICIOUS

PDF

83.4 KB Created: 2021-09-20 19:47:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 2d54e2db3c3d8557ff9c80b37b4f4e6a SHA-1: 26c3415d5766eede96a1956cce353cc916ea10ac SHA-256: 805e7f65affd56c72d35db94ee765d8ff5d2d94483c1ee2b1ff67cbee26aaaf0
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised CMS uploads or are part of a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The primary attack vector appears to be a malicious PDF attachment, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://sangjeom.com/userfiles/file///21934545339.pdf In PDF document text
    • http://thainightjob.com/ckfinder/userfiles/files/joxoxarutisiwokuxetumusu.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/16144e9f5b6490---fetoxajobanenuzidut.pdfIn PDF document text
    • https://iqrainternationalschool.org/_assets/files/56108181764.pdfIn PDF document text
    • http://jcpingie.be/public/files/4972812072.pdfIn PDF document text
    • https://er-cardiff.com/eurostyl/photos/file/putidezalunisolowabirib.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/85169392731.pdfIn PDF document text
    • http://artospace.com/pics/file/84330660311.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142e1e0c38d3---jakivipex.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161426d2f952ef---xigebawidik.pdfIn PDF document text
    • http://chiari-web.com/ckfinder/optimist/files/bovepavagojosax.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bbb6b85f51---46917306928.pdfIn PDF document text
    • http://sh-songshi.com/admin/upimg/file///80585997115.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210914_581945D4072F567A.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/43107092027.pdfIn PDF document text
    • http://pravkniga.ru/files/userfiles/files/34435574995.pdfIn PDF document text
    • https://pasarantogel.com/contents/files/kekawuso.pdfIn PDF document text
    • https://global-product.org/CKEdit/upload/files/76632364756.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/0ad79c0ba5ae7d2b4ed358bcfba2801c/lukupe.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/xepofujunur.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/xovanebifizexuruwuf.pdfIn PDF document text
    • http://cloverdiamond.com/file/kiwipafarak.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/75458704154.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/ridulolip.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16139b8510ff44---7066077393.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=naruto+senki+overkill+2.0+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_off0000de5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE5E 11012 bytes
SHA-256: 54e49d0a8422434f482484f4a2ba2471abd2a297521b39fcf48fb9d6e69d6c60
font_01_sfnt_off0000f82f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF82F 18156 bytes
SHA-256: c9790807bb8fbc3729ce880d7f793c39fd7f791acf722ba6c9d027aba2b8126f
font_02_sfnt_off00012703.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12703 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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