Malicious PDF — malware analysis report

Static analysis result for SHA-256 31f8cf31ad590e48…

MALICIOUS

PDF

78.1 KB Created: 2021-09-08 11:24:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a5ee77dfd1e44f01fd2911eb63561d59 SHA-1: 8e890bcb5ad26e234c530df3df56ef90d89feff2 SHA-256: 31f8cf31ad590e489d0f342132198af92eb0e92c62c78c6d2cb78a48fc6641d9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. While no scripts were explicitly extracted, the nature of PDF link farms often involves JavaScript to facilitate redirection or exploit vulnerabilities.

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://herbwaterthailand.com/userfiles/files/lejusup.pdf In PDF document text
    • http://carrozzeriabosini.net/userfiles/files/kevimixutep.pdfIn PDF document text
    • http://gasthaus-steinkirchen.de/img/editor/file/zenedimuborotufasogulozuw.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de4ef3b2121---varokubigeg.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/45992698162.pdfIn PDF document text
    • http://waterreducer.cn/d/files/sonusotokopamotus.pdfIn PDF document text
    • http://handgun.ee/media/file/22076685525.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/tuzusa.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab024cc1a36---vapum.pdfIn PDF document text
    • http://metapolar.hu/tmp/kobubegema.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/06d0bc38883701044ca17d718f37e24d/bosajobepagezu.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a569010b4---bomabiwemalovunuwabawepek.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a52839127e3---39872508929.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/5061129810.pdfIn PDF document text
    • http://baheth24aqari.com/ckfinder/userfiles/files/wiwabojusipotezevawilu.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/60e9a576d6663795a1f3dc2a98fe9793/xagibagibijutekerosese.pdfIn PDF document text
    • https://thietkewebseo.com/webroot/img/files/57741934686.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/vawosoze.pdfIn PDF document text
    • http://ellerbeefamilyreunion.com/clients/874543/File/vizuj.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/89746593985.pdfIn PDF document text
    • http://archiwum.wyryki.eu/admin/ckfinder/userfiles/files/67827177981.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef51e09c1a---motuvezatowir.pdfIn PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/45477267601.pdfIn PDF document text
    • https://gea99.com/ckfinder/userfiles/files/81379034291.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=homonyms+in+tagalog+worksheetPDF 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_off0000cde6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDE6 17144 bytes
SHA-256: 8ae7fec36fa3adf02dc3e7c3f1b3827ec4ed843f36a4b818dca455151462df0b
font_01_sfnt_off0000fa4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4C 10840 bytes
SHA-256: b253e9879b1e987c943028e1a1302ec9f31b566a83ec5854488f4ebf73a62903
font_02_sfnt_off0001132b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1132B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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