Malicious PDF — malware analysis report

Static analysis result for SHA-256 906578864930991a…

MALICIOUS

PDF

78.2 KB Created: 2021-09-20 16:34:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1b126d6179396c7201032142b5b13233 SHA-1: 917cbb737be7227e17ecd0188118cc394856b005 SHA-256: 906578864930991a5e0b20652b0434f8ff8ab9368737d17bce2ccd6857b8d0e7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to potentially compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and external links are indicative of a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://eiak.org/upload/editor/files/69371796083.pdf In PDF document text
    • https://lanegarrett.net/userfiles/file/45572853871.pdfIn PDF document text
    • http://kasand.com/userfiles/xupijawivuwodiloberos.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/jasawuvo.pdfIn PDF document text
    • http://mirai-kankyo.com/userfiles/files/wawadu.pdfIn PDF document text
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/tuluge.pdfIn PDF document text
    • http://nissanotogovap.com/uploads/images/files/51342606100.pdfIn PDF document text
    • https://martan.es/cenavarra_userfiles/files/80875779561.pdfIn PDF document text
    • https://planningpvedh.nl/ckfinder/userfiles/files/80119262553.pdfIn PDF document text
    • https://pabxlg.com/userfiles/file/27238225413.pdfIn PDF document text
    • http://morard-mcf.fr/data/Files/jopixupojejetalafib.pdfIn PDF document text
    • http://vaynhe.com/upload/files/20169176917.pdfIn PDF document text
    • https://trvstore.com/userfiles/file/kodurivogetibarusonivako.pdfIn PDF document text
    • https://noithatkuongthinh.com/uploads/files/fozuwufupuvuri.pdfIn PDF document text
    • http://www.omt.ntou.edu.tw/ckfinder/userfiles/files/semoweke.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614489f34c7ff---dobepep.pdfIn PDF document text
    • https://concurs-euclid.ro/upload/fck/18910924276.pdfIn PDF document text
    • http://ucg-eg.com/userfiles/file/76011249285.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16140edab96a91---95346098398.pdfIn PDF document text
    • http://sbairs.com/datas/files/fajaviwe.pdfIn PDF document text
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/36445895458.pdfIn PDF document text
    • http://playbabydoll.com/userfiles/file/17341196694.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ece9048709---viwilabuguwavodebepititem.pdfIn PDF document text
    • http://hai-bi.com/uploads/files/202109020817331696.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=rbxstorm+earn+free+robuxPDF 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_off0000c644.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC644 20008 bytes
SHA-256: 7b63a5cd9a6d9b325ff464c9d370cf842f991a4ef8705e1632c2e6b80097c7ce
font_01_sfnt_off0000faec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAEC 10624 bytes
SHA-256: 55ca503e33cdd4baf8a3ab245473a1cb38034f76abf61daa730230c0adef48a7
font_02_sfnt_off0001134f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1134F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1