Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b9c35c4d3bc32af…

MALICIOUS

PDF

81.7 KB Created: 2021-09-01 04:51:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 23d6e0d1f14578e695125c5800a5a6c6 SHA-1: f7f1c18f52ccf5da36443d82922df0b04e3fa7e9 SHA-256: 2b9c35c4d3bc32af04bcb2ec1b0ff161e1e64c63588f5ed94b14355074fc8407
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to distribute malicious files. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://almoheetmanpower.com/public_html/userfiles/file/jurutaxofow.pdf In PDF document text
    • http://the-bom.kr/upfile/files/fudipeluguj.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b979c528a---buzarosi.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cddd8292ca---89718730902.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e37aa83f4cd---pebumowiv.pdfIn PDF document text
    • http://cuatudongbinhduong.net/uploads/files/25218919490.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160886cde59d6c---59489958166.pdfIn PDF document text
    • https://termoformat.md/img/files/83313263680.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/5110e749f2caeadae434cd0a30c73150/sitizosazuviwurewefuna.pdfIn PDF document text
    • http://artiguardia.pl/userfiles/file/lirafuzuwugopatelemolima.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/91f5b1753b323e806ba892f9bd67bc0e/4808842577.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a979c768ef5---mexalupekulisugedumo.pdfIn PDF document text
    • https://myshalewell.com/userfiles/file/xinifuguxomikiluguniv.pdfIn PDF document text
    • https://smobiil.eu/userfiles/files/bozanixesukexajalemeva.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021052901002070.pdfIn PDF document text
    • http://osstemcardiotec.com/files/fckeditor/file/1984764655611a8ad8befa9.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160befe2852ada---80998236340.pdfIn PDF document text
    • http://aotwresort.org/ckfinder/userfiles/files/57004189735.pdfIn PDF document text
    • http://kistours.hu/userfiles/file/nadetafomopo.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/hejuj63k4o10juf1qqa1sksvjp/94092263980.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073b5c011870---34624651178.pdfIn PDF document text
    • https://shieldtech.cz/ckfinder/userfiles/files/jataxojir.pdfIn PDF document text
    • http://aaz.sk/editor_uploads/files/93786664772.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/86kupqb79a95abcbu445vdn143/vonubufix.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/sokosowu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=history+of+africa+by+kevin+shillington+pdf+free+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_off0000d606.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD606 11388 bytes
SHA-256: ec59c9aa43256e1fbd01e586b919c3e9c9f8e8f9bdde47eb05baee94602178d9
font_01_sfnt_off0000f07c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF07C 18204 bytes
SHA-256: 6a7ad8970ac71bcd5aeda84ad87f512ca45f2e68dc4781f57d1d73de070b8e65
font_02_sfnt_off00011f7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1