Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2a61e0b1575b473…

MALICIOUS

PDF

180.3 KB Created: 2021-07-08 10:00:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: bda2a1180341f6e2d7f17b29f2046590 SHA-1: 3324b1871fd8886c0085f0197f41f814405a6b14 SHA-256: b2a61e0b1575b47341ea605f426a3211ec9dc48640ec47b3f8a7c8b5c25a2131
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous embedded URLs that point to compromised WordPress sites, likely serving as a distribution point for phishing or malware. The heuristic findings confirm the presence of a link farm on disposable hosting, suggesting an attempt to obscure the ultimate destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d8ab5ea09---92487650525.pdf In PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16098a89272d76---12193021761.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/5b68f9abc34e3f2365247bbc7f271233/pitorasunejiwozolek.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160943c254070a---80569520594.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080cabba1a4c---7097940068.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/36660533701.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cff4e37da86---6072690121.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/vatovo.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/kalanuwere.pdfIn PDF document text
    • http://soleilboo.com/images/uploads/files/90124018190.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/vofalubusobunapipumovatu.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/17442852810.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/f9qtroevjl2o5eobbb1sq6rslv/jabezusogapunode.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/bipujanezituzoxojemis.pdfIn PDF document text
    • https://psystat.net/candyticket/uploads/page_images/files/xisavobabaleganikijesoser.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e51a8dab296---46667256188.pdfIn PDF document text
    • http://conelser.hu/fck_uploads/file/29425688049.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/74fcf4c8099517cf3f44a9fff72a1aab/53507418827.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee0eb2f681---mibonexugafebitupu.pdfIn PDF document text
    • http://northphoenixmustangs66.com/clients/4/4b/4b49b54eec06ebba3741256e9f3e6f2b/File/77658807646.pdfIn PDF document text
    • http://karpatskiles.ru/store/files/56616992772.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=sir+isaac+newton+the+ingenious+scientist+questions+and+answersPDF 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_off00025be3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25BE3 20208 bytes
SHA-256: 735c49a077e072da98bde373c3e9e06b48aa8364be1e699c4690a24de51402ec
font_01_sfnt_off00028fd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28FD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0002a7ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A7EA 11012 bytes
SHA-256: 82c37b25b60ab11db2aa505fba9820862c15bfbf9bfc66292a940a95928ea02f

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