Malicious PDF — malware analysis report

Static analysis result for SHA-256 85eba1808a74dade…

MALICIOUS

PDF

79.8 KB Created: 2021-09-19 06:23:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 714d9056133815cb672a897600c62e6b SHA-1: 2585b37237bf0db87ee7e546fe73f6c465c86597 SHA-256: 85eba1808a74dade5e37ce62c053249e6362d62a5cb10f64e0337529a4a79f06
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress upload directories, suggesting a link farm designed to distribute malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/16144b344e22f0---rafepufeluzimoje.pdf In PDF document text
    • http://cesvil.it/filesUploads/file/19682015465.pdfIn PDF document text
    • https://gazeta-msp.pl/user_files/File/31636809655.pdfIn PDF document text
    • http://optimaglobal.net/ckupload/files/luwofe.pdfIn PDF document text
    • http://postelezmasivu-brno.com/ckfinder/userfiles/files/mukujalokipowu.pdfIn PDF document text
    • https://erdemlerkoleji.com/resimler/files/detadiwow.pdfIn PDF document text
    • http://nuocmambason.com/upload/fckimagesfile/74caa23feb3079f76e7f9205cc168fd9.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a26fba2d91---pixowove.pdfIn PDF document text
    • https://www.hermanosvalerorecio.com/ckfinder/userfiles/files/jefibizaxosubajonivux.pdfIn PDF document text
    • http://lamarchesainterita.be/lamarchesainterita/imgdb/news/files/78101032701.pdfIn PDF document text
    • https://www.tvmreza.tv/ckfinder/userfiles/files/zitasexubenupaxu.pdfIn PDF document text
    • http://peoplefoster.com/pliki/wipod.pdfIn PDF document text
    • http://kechengchem.com/upload/files/deneje.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/tonizebudoxojivabaduvajiw.pdfIn PDF document text
    • http://karcannakliyat.com/userfiles/file/bebozipejenegiteromu.pdfIn PDF document text
    • http://nusamulticentralestari.com/Uploads/userfiles/files/92325001258.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/warala.pdfIn PDF document text
    • http://autoklej.pl/app/webroot/media/files/4896585053.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136a91a6c424---mofukonufudomutigomuru.pdfIn PDF document text
    • https://vkgnassociates.com/dayafter/uploadimages/newsimages/file/93563437688.pdfIn PDF document text
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/88098927165.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/sifajaxavasibatizawabigim.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd150e568b---korojebamemajesal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=call+recording+afkPDF 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_off0000d4c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD4 17368 bytes
SHA-256: 69ba659ccc4449b9cfe9f04f7e61d000cb96f6a2c44b6062c3f371aca909369f
font_02_sfnt_off000119c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119C8 10508 bytes
SHA-256: b1fdfbbe647b34eb41d2700ea59fc8936e7208ec719388b0128e28c67cf94f17

Open this report in the interactive analyzer, or submit your own file for analysis.