Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e227c9974fd7fb1…

MALICIOUS

PDF

71.6 KB Created: 2021-10-02 14:45:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: dac105478db2e0da8aa087509048c2ef SHA-1: 6bd3fa19da4b20de4ff9cbe7ef08ef0318011c27 SHA-256: 7e227c9974fd7fb158b8b2ca07294cbb4863a1feca67d48ae2571fd54c08ba3b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which point to domains identified as disposable or compromised, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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 http://xn--o79av69abka850ab6c.com/upload/file/202110010556586468.pdf In PDF document text
    • http://etkenkalip.com/files/11321725351.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/30966041087.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161322f3c4530f---negizumamameruwudixadom.pdfIn PDF document text
    • https://objednavky.dortovapohotovost.cz/obrazky/files/24297925134.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/17691846773.pdfIn PDF document text
    • http://marketingnews.fr/images/file/18314291919.pdfIn PDF document text
    • https://cyc-catering.pe/disac/userfiles/file/tidedugatum.pdfIn PDF document text
    • http://fuerst-architects.com/uploads/file/mifesajiwajopif.pdfIn PDF document text
    • http://autoscuolavalerio.it/userfiles/files/63556880523.pdfIn PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/rogutex.pdfIn PDF document text
    • http://ex2010.com/uploadfile/file/2021090422423973499.pdfIn PDF document text
    • http://serenetour.com/image/upload/File/padoko.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/lepekupewirerorum.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/tibif.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615222d84a0d5---31666638684.pdfIn PDF document text
    • http://ilkemymm.com/image/files/davezusalekinelar.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614889cac968f---sozideputugikozale.pdfIn PDF document text
    • http://snft.ro/media/file/91593338520.pdfIn PDF document text
    • https://ismet.com.br/ckfinder/userfiles/files/gudifajodufi.pdfIn PDF document text
    • http://enslev-anlaegsservice.dk/userfiles/file/kununutabu.pdfIn PDF document text
    • http://25630638.kad.tw/kads/ckfinder/userfiles/files/70475372613.pdfIn PDF document text
    • http://emblem4home.com/UserFiles/Member/File/gotimipenuxivesodefover.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/ccc7b2916b300d7ef2b02b227aa949c9/sujisufob.pdfIn PDF document text
    • http://morard-mcf.fr/data/Files/dipugan.pdfIn PDF document text
    • http://k1a.ru/images/files/file/33708401807.pdfIn PDF document text
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/3265256764.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=largest+wan+in+the+worldPDF 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_off0000b733.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB733 16432 bytes
SHA-256: 31be281eee4ae9c8d5a03c2dae9efc311f54799a5b4c15b806c93a5494fe2f49
font_01_sfnt_off0000e0a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f8ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BA 10572 bytes
SHA-256: f0fee914d8a3bdca759a36a565ca41c9edc391ee13ef109e8f96e500412dc886