Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcd8891ef559dc1d…

MALICIOUS

PDF

78.3 KB Created: 2021-09-16 17:06:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0d21f33bba19671ef47c11d207da1470 SHA-1: b227e4446d7e51f2ee7834f786b2821c2cef7538 SHA-256: fcd8891ef559dc1d9c8b9fc77a50762bb6f853c6bbf4b896109e56712e55fd78
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to various websites, some of which are hosted on compromised CMS uploads, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the heuristics strongly suggest this PDF is intended to redirect users to 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 https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613045523cee3---48921502566.pdf In PDF document text
    • https://shopinhome.com/ci/userfiles/files/48555552072.pdfIn PDF document text
    • http://www.fd.ntou.edu.tw/ckfinder/userfiles/files/24193897192.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/pixof.pdfIn PDF document text
    • https://basundharamart.com/userfiles/file/19404082578.pdfIn PDF document text
    • http://meubelenindex.nl/images/uploads/59149429501.pdfIn PDF document text
    • https://stradatextiles.com/upload/ckfinder/files/32266796261.pdfIn PDF document text
    • http://swiss-ex.com/images/blog/file/titeruvamitenukugaxunimoz.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/sezopokoxebofupafepopus.pdfIn PDF document text
    • http://smeeing.com/userfiles/files/soxevubexumigixetuku.pdfIn PDF document text
    • http://maulich.vn/attachment/files/83197418789.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/df2fcbecc291a34bd3a2e32a68093134/4516424382.pdfIn PDF document text
    • http://kleinschadenexperte.com/userfiles/file/83432863990.pdfIn PDF document text
    • http://gpkoaee.ru/ckfinder/userfiles/files/tupeguwisinonusatobupeket.pdfIn PDF document text
    • https://xebecdesign.com/xebec/userfiles/file/16313456100.pdfIn PDF document text
    • https://parkettworld.com/upload/files/piwonadovoratewesimabasep.pdfIn PDF document text
    • https://ruh-center.ru/userfiles/file/71046624620.pdfIn PDF document text
    • http://natpuedu.in/userfiles/file/15620932564.pdfIn PDF document text
    • https://ylwlgwadmin.ylwl.cn/upload/files/74975424702.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/0vks9vm7s9p7jhsros1ds4m0nn/zuzoxanovenu.pdfIn PDF document text
    • https://coebmsf.com/userfiles/file/28917372166.pdfIn PDF document text
    • http://www.agot.pl/upload/file/gugopu.pdfIn PDF document text
    • http://thaisomboonautopart.com/userfiles/files/5692636023.pdfIn PDF document text
    • https://dienmayminhchau.vn/uploads/news_file/42591803960.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=japanese+market+apkPDF 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_off0000d25d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD25D 10240 bytes
SHA-256: 90c69349695ea6ca658d6323aa388e939b4b69b0bfa92ee2a19b395666d313b2
font_01_sfnt_off0000e95f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE95F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10171 16388 bytes
SHA-256: 1bdb79811467f5b9fd25e9d63c8a167cdf6754ff8c3de709172fee3794c96513