Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdd3deda8804840f…

MALICIOUS

PDF

82.4 KB Created: 2021-09-18 17:50:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 9910286608c843d7f6205ed4d95a06bc SHA-1: 0e37059975ed4890f7bec26788565b271bf8e9c3 SHA-256: bdd3deda8804840fa3fb15b498ec5870638ef3b84650933dcf9db2a0d3963f91
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic confirm the document's purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pilot-market.ru/new/files/file/lunifewe.pdf In PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/4aa0e0e5d310567539d04eb83ba1458b/47892878440.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/kokutimix.pdfIn PDF document text
    • https://carolinevlieghe.fr/images/file/35382659455.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614416f4ce76e---949103498.pdfIn PDF document text
    • http://abwmercury.com/uploads/files/ladobomim.pdfIn PDF document text
    • https://dgaspcsm.ro/ckfinder/userfiles/files/lexezawazadumivovomix.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/16130bd91be283---59508961712.pdfIn PDF document text
    • http://ipllaser.in/uploads/98022613484.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16143df22c3284---gutelufu.pdfIn PDF document text
    • http://www.niceresidence.net/image/upload/File/9862549324.pdfIn PDF document text
    • https://emotionalgift.com/ckfinder/userfiles/files/9920885805.pdfIn PDF document text
    • http://bn-biz.com/userData/board/file/javakedajalonisagupu.pdfIn PDF document text
    • http://tnmetalworks.com/images/files/37743751108.pdfIn PDF document text
    • http://www.florentmaussion.net/userfiles/File/64084435761.pdfIn PDF document text
    • http://konsultacjenaukowe.eu/Upload/file/80533872910.pdfIn PDF document text
    • http://sweed-trans.eu/ckfinder/userfiles/files/90379918375.pdfIn PDF document text
    • http://getsolarny.com/userfiles/file/nadekodipazefarimapofe.pdfIn PDF document text
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/sopurono.pdfIn PDF document text
    • http://makairways.in/home/makairways2017/public_html/dowalumniusa/ckfinder/userfiles/files/10251442415.pdfIn PDF document text
    • https://angem.fr/userfiles/file/jekorofolabezitunobakur.pdfIn PDF document text
    • http://0228339500.kad.tw/kads/ckfinder/userfiles/files/fafizegopijosofixepavene.pdfIn PDF document text
    • http://ruihuitax.com/files/file/gapiridukiguferer.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/xuduga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=best+apps+for+note+10+plus+s+penPDF 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_off0000dd54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD54 10588 bytes
SHA-256: ee9067f06388471bf43e88a1d8a887ec6cd8ca994db53eda3fa4d7030066acf2
font_01_sfnt_off0000f5bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BD 17664 bytes
SHA-256: 3d5957bc311b3873434f3c096496320b2dd0b7ab3eca8b309db0f8f42161dfef
font_02_sfnt_off000123bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1