Malicious PDF — malware analysis report

Static analysis result for SHA-256 d792653729a8d4ef…

MALICIOUS

PDF

75.2 KB Created: 2021-09-25 16:00:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c1884249e6d214889c471ca68f16c975 SHA-1: 20ef8e689c393c8c39802f1c1900bb9556778e7f SHA-256: d792653729a8d4efa16ea68375c79c8908ae0b6d6df49536243ad17f9461abfb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links, many pointing to compromised websites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The document structure and link farm behavior align with techniques used to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://avvolodin.ru/upload/file/tilijoladivovinivabatejef.pdf In PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/161345617b401f---piwosamelovazujupi.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/23280624776.pdfIn PDF document text
    • https://i-intelli.com/ckfinder/userfiles/files/21381982731.pdfIn PDF document text
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nululiribegilusaj.pdfIn PDF document text
    • http://azizolace.cz/images/file/sejixelepogusaferipojilem.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/sotilepiduwoxosubot.pdfIn PDF document text
    • http://cosyromania.com/media/file/83307717899.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147932254d5d---xifukowonoxononujukutu.pdfIn PDF document text
    • http://hastensandbreakfast.nl/userfiles/file/kuboluxujiteguv.pdfIn PDF document text
    • https://godahoian.com/app/webroot/upload/files/85195559068.pdfIn PDF document text
    • http://pcccmiennam.com/media/ftp/file/49098209935.pdfIn PDF document text
    • https://halkapsikoloji.net/userfiles/file/pikeweverafesetasud.pdfIn PDF document text
    • http://chugguwang.com/files/fckeditor/file/44681869043.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/gokefixox.pdfIn PDF document text
    • http://pawsandtiaras.com/ckfinder/userfiles/files/88896254644.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/43193652281.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140a1c49b6ad---61185875505.pdfIn PDF document text
    • https://keluargamimpi2.com/contents/files/fodebejiduzugisovumigasov.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/94689336365.pdfIn PDF document text
    • http://twilaw.com/files/files/rubexipexikizagigina.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/161354a10e5d69---nitekarabadava.pdfIn PDF document text
    • http://lixupeng.com/uploads/files/pozazepowebawix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=car+spawner+gta+sa+cleo+4PDF 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_off0000bf7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF7F 10652 bytes
SHA-256: 7f49148379bf23f3a2705fa07a6522a9f3c249abbe5ef6bcea3df770e3a36688
font_01_sfnt_off0000d828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD828 18108 bytes
SHA-256: d8035ff8e7d76ee0e66a4440e3ae4f6e1d5f8efb8cd549e319f343bca1a91479
font_02_sfnt_off0001073c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1073C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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