Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b2b1cf99dbe13ab…

MALICIOUS

PDF

85.0 KB Created: 2021-09-06 07:05:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f1b5b248b4d59299aee33d7919c4c94a SHA-1: 179b9f6d6ed19376534fc2a7090df4f0e36c9919 SHA-256: 8b2b1cf99dbe13ab0388763f1b5194c944935447fdfb4c51e41e6fc6e9edd960
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly indicate a phishing or malicious redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.padanguparduotuve.lt/ckfinder/userfiles/files/lolilo.pdf In PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/35073165328.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/84540725615.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/kekesabe.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/42893958868.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de0a0eeae99---gojajofopizorabojoma.pdfIn PDF document text
    • http://splogservice.ru/content/file/xerogam.pdfIn PDF document text
    • http://tantusmarina.com/UserFiles/file/gemexil.pdfIn PDF document text
    • http://thebrownsfamilyreunion2008.com/clients/81208/File/81559576898.pdfIn PDF document text
    • http://licausi.it/userfiles/files/10416012539.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/5adcfc93650a3db14c3de264b82ecf57/25205295925.pdfIn PDF document text
    • http://primaria-ciocirlia.ro/media/file/jemidodemidugexev.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/l663e6csmcko5p6ebp7skfle2n/45997191415.pdfIn PDF document text
    • https://pmfegypt.com/userfiles/files/lumijosoxo.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/81645816357.pdfIn PDF document text
    • https://lifo-sea.com/ckfinder/userfiles/files/43993262967.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/63923030071.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16072c386a6fb5---zuviturana.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/d9db2addbdb14ddd5767ca4b7926fa75/metepim.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/86mn568bvi4s6renskt21ji97v/rejopanudibozoropelado.pdfIn PDF document text
    • http://ipublicity.cz/data/file/fedavesosudi.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/zironeg.pdfIn PDF document text
    • http://allasclub.com/campannas/file/7751214119.pdfIn PDF document text
    • http://cmtoolsrental.com/user_img/files/30542273666.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=engineering+graphics+and+design+grade+10+textbook+pdf+downloadPDF 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_off0000e5fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FC 17388 bytes
SHA-256: 547ce66e5d26bfb0709f16891146cdeb91be3138c38a025dc8dd6d4fc9e3b701
font_01_sfnt_off000112c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012adf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ADF 11476 bytes
SHA-256: dc4bff1f7809ceb892f3265e2d62fade8b0d3b01b7e82eb63a9f53a461abff3f

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