Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e2bf1302ff3d3b2…

MALICIOUS

PDF

97.9 KB Created: 2021-08-08 20:35:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: cc628ea1fe95f2375c2144f4175645fe SHA-1: 8e83c4d9a0f6e1114e62ed8d7f203580a8a9aa66 SHA-256: 5e2bf1302ff3d3b25b05d9655c97cbb7768fa1e7818758a0eb92a3f6570ee63d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

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://bezagsecurity.cz/userfiles/71419724118.pdf In PDF document text
    • https://drsoleimani.ir/userfiles/file/45064439526.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/79976411098.pdfIn PDF document text
    • http://asztalosweb.hu/userfiles/file/96996958023.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/5785be59056f221a0b0f1d2159301036/49729259472.pdfIn PDF document text
    • http://pozitron-s.ru/userfiles/file/84312719010.pdfIn PDF document text
    • https://securitydm.com/slicice/file/mefosefolepajif.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607148fee8581---perofuroxipu.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c2e146109---xanagiberireku.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/d7f77c2b303822a1d80e5a6000aece40/4493719337.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/nojub.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/rirolajitavewetu.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/22505780295.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/3af4b0007d9efea709abfd78c4d2cecb/43162375499.pdfIn PDF document text
    • http://beming.com/ressource/site-image/files/68545744097.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a138d85b0---13214847749.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c86a1b3ed90---91631570022.pdfIn PDF document text
    • http://mp-journal.com/media/file/sujad.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e04294513a---sozixewogorelefupuwuna.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a20ac141736---ropovexajoxejo.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/wusotejov.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/6145711059.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/94653913929.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afa80083a9d---36014788747.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=what+is+the+teaching+strategies+goldPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDB 10644 bytes
SHA-256: 0d92025d9229cb45b27bceb0213c215da9d96e08cc40aef78b27f8b6ce857242
font_01_sfnt_off000113f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113F8 17640 bytes
SHA-256: e4538fa83fa96525e96b7a8d3d3b6aa8740e6db1f48b6b49ec5e62e71ef01f64
font_02_sfnt_off0001426c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1426C 18260 bytes
SHA-256: f9d4d8002bb13e1e6fa1127db3af58eb4fb51440fea935d9b8a16071a95e773d
font_03_sfnt_off00015f5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1