Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1ce76af9e609ab5…

MALICIOUS

PDF

86.2 KB Created: 2021-09-21 07:55:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: e6be2b3ec2bff0bfecdbee255a4d160c SHA-1: ee4e69646697fad1864e452b8773cb0720536240 SHA-256: f1ce76af9e609ab5dc0733d72c2e864c6c6ef662021b9d4049d14d70f9ae156f
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, pointing to multiple compromised CMS upload locations and disposable hosting sites. The embedded URLs, while some are marked benign, contribute to the overall malicious intent of directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/tqobll1cr9nsu47j845ffs77m3/72479720827.pdf In PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16137daf3bc094---difarirolewonafot.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1614652bcc7139---7833040050.pdfIn PDF document text
    • https://learningsolution.ca/userfiles/files/vetamodabajon.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/zigofagaka.pdfIn PDF document text
    • http://morard-mcf.fr/data/Files/32212862570.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/punixafotoxupesagefifita.pdfIn PDF document text
    • http://bainihu.com/upfiles/editor/files/87890694081.pdfIn PDF document text
    • http://bushurov.ru/images/files/55121729133.pdfIn PDF document text
    • https://vibanghanoi.com/uploads/files/2127478227.pdfIn PDF document text
    • https://clubkdo.fr/img/pics/files/56435730051.pdfIn PDF document text
    • https://fotojursa.cz/userfiles/file/fawuvobuk.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/b5e52052f8e18871b6655b965ddd7d42/35952624126.pdfIn PDF document text
    • https://drlalashow.com/php/billboard/uploads/file/kuzenutudi.pdfIn PDF document text
    • http://www.szphotar.com/admin/img/files/jimaku.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6deb5df7c---79155508399.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021091004072973499.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16132c4915789d---vinagiridabifasabezib.pdfIn PDF document text
    • https://infotechsystemsonline.com/ital/www/img/file/24531636830.pdfIn PDF document text
    • http://gzcil.com/uploadfile/files/mugudizezutelepodax.pdfIn PDF document text
    • https://alrukn.co/userfiles/files/ditewobes.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/nanobegalavakojifof.pdfIn PDF document text
    • http://rockpapersun.com/upload_mce_image/file/pugabidenoxi.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/wofadedaxefizifes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+make+android+game+with+android+studioPDF 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_off0000eed6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED6 16880 bytes
SHA-256: 4475abe1cb39f0e44c3fda63872e5a00fb88a889e69f2b68baf4b96242e4e3da
font_01_sfnt_off00011a71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A71 10920 bytes
SHA-256: 04c9853df9d88126be777b5fddcafaaa95cd39af83d51ecbb50d4fcaf57a52c4
font_02_sfnt_off00013355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13355 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1