Malicious PDF — malware analysis report

Static analysis result for SHA-256 394b1f24cca941ed…

MALICIOUS

PDF

73.2 KB Created: 2021-09-25 08:52:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 34a3e953cea0e3b85e11a01f92032f51 SHA-1: f74ce744fc32b2c93b32b5595f1962dd81e79b23 SHA-256: 394b1f24cca941ed981ade147d59ae9f6974551d2b398274d7094f73ce9f5e0d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 https://coretry.ru/uplcv?utm_term=como+copiar+y+pegar+android PDF link annotation
    • https://fonixkoncert.hu/upload/file/1496831567.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613985d3cc83f---41903011904.pdfIn PDF document text
    • http://come2menorca.com/images/file/39492087019.pdfIn PDF document text
    • http://www.tokyomagic.jp/images/library/File/fiwewezodewujilakod.pdfIn PDF document text
    • http://stefani.cz/fck/file/suzezeruf.pdfIn PDF document text
    • https://nenmongdangquang.com/upload/files/sunepesedoxupebireresudex.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/dojor.pdfIn PDF document text
    • http://www.louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/xuxagodijisolixev.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/927dd9dd99dca190fcbbc6101cb89140/jodozewixovemus.pdfIn PDF document text
    • http://dexgerm.com/data/file/userfiles/files/bolazokod.pdfIn PDF document text
    • http://chpcentre.com/files/file/8371714374.pdfIn PDF document text
    • http://damosushipleasanthill.com/uploads/files/66100532439.pdfIn PDF document text
    • https://emenu.hu/editor_up/zenupa.pdfIn PDF document text
    • http://lovesenergy.nl/file/19367994457.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/2bf30b692d532a4d28937ee59a82d803/86776118388.pdfIn PDF document text
    • http://taixingchem.com/uploadfile/file/20210907160202054.pdfIn PDF document text
    • https://zzwgjx.com/d/files/50213365353.pdfIn PDF document text
    • http://anadolumatbaa42.com/genelresimler/file/burinenejor.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/pdled2oi916edmfeh83chlvce1/21768813671.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/mavunojenolagegife.pdfIn PDF document text
    • http://npk-bypassdrr2.com/file_media/file_image/file/siripumopobodomiselejoka.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/61645780358.pdfIn PDF document text
    • 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_off0000b9d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9D8 17488 bytes
SHA-256: da6a8ae247a79c901d9c1bd368b35acb9710f6885ed5f5eb432e58b0ffd55d29
font_01_sfnt_off0000e712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE712 10688 bytes
SHA-256: 43a2a846e77d3b658098e9bf55cd405654646304ee1e266ebf794ea8a7f56d97
font_02_sfnt_off0000ff58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1