Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f811856ab44c9c5…

MALICIOUS

PDF

82.3 KB Created: 2021-09-16 01:43:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 82ea2870492a2b505b099e7bbbeb2260 SHA-1: dc087d06230f47050596c7dfc0acabb1bbcde4d5 SHA-256: 9f811856ab44c9c5b286dffda03cb6c6303cf50a972b3d73e4696e6840fb18a3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm used to redirect users. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this. While no scripts were explicitly extracted, the nature of the links and the overall detection suggest it's used as a lure, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://laborke.ru/uplcv?utm_term=modificare+file+pdf+android PDF link annotation
    • https://cartolmania.it/file/64618068459.pdfIn PDF document text
    • https://daiichitravel.com/uploads/news_file/wineporurutule.pdfIn PDF document text
    • http://ptichile.cl/userfiles/file/rajelag.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/nanadagokuwamesog.pdfIn PDF document text
    • https://taevlingar.se/images/pages/file/49974995907.pdfIn PDF document text
    • https://piataafacerilor.ro/app/webroot/files/userfiles/files/nilexu.pdfIn PDF document text
    • http://chenruichem.com/upload/files/zidekejenowiwoxaweju.pdfIn PDF document text
    • https://ispartaorganizasyon.com/ckfinder/upload/files/rapowezunufotenababuki.pdfIn PDF document text
    • http://karat-dobremiasto.pl/userfiles/file/sekiditupopina.pdfIn PDF document text
    • http://arcadia-fitness.es/userfiles/file/3759793977.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142609272e7d---zuwunaxuluxumixijerojoje.pdfIn PDF document text
    • https://superlitefan.com/uploads/files/xenunesotunevetozejake.pdfIn PDF document text
    • http://palami.by/images/file/xulolipuxuzevuxuboguv.pdfIn PDF document text
    • https://2b3la571ga-70p.com/contents/files/53829056242.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd22680d30---79867412801.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210901114531_swuw4l.pdfIn PDF document text
    • https://superpackeg.com/userfiles/file/98497726600.pdfIn PDF document text
    • https://iva-vietnam.com/userfiles/file/gikupifol.pdfIn PDF document text
    • http://benrassam.com/uploads/files/72994091272.pdfIn PDF document text
    • http://homeopathyhongkong.org/files/sanomasum.pdfIn PDF document text
    • https://ystechpro.com/nbloom/fckuploads/file/76171228754.pdfIn PDF document text
    • https://luckyfood.itweald.com/uploads/files/6141fe71e9ccd.pdfIn PDF document text
    • http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/35825096571.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/5addc556224d8ab690faeaf7663bee15/12721319447.pdfIn PDF document text
    • 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_off0000dd1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f52c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF52C 18284 bytes
SHA-256: 7e1a390245b61327526ebdc03e5a1ddcb93f8d41424d4cc58811a6bfe563f913
font_02_sfnt_off0001249c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1249C 10340 bytes
SHA-256: 9b137bd06563b62e1394afb1074ee972332688b661d491755df47ed9f5d3629d

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