Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f5355da4a9006ad…

MALICIOUS

PDF

80.5 KB Created: 2021-09-05 13:05:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d8ac40e177f1e0debe8946c5e3f3ab82 SHA-1: deebda35d3b489dbbd5a8805126c75b127e485cc SHA-256: 9f5355da4a9006ada92925e2ed8727272b95022f4271295ee4972cea7351d50d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to potentially compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URIs indicate an attempt to exploit users through deceptive links, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://kaies.cn/upfiles/210531014634178158rdh9go.pdf In PDF document text
    • https://ascend.sut.ac.th/ce/2017/src/plugins/ckfinder/userfiles/files/poduwexuz.pdfIn PDF document text
    • http://thallo-food.hu/uploads/ckfinder/userfiles/files/nulawopexuxu.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/vuvazujusefu.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ac49d0dbb---zosigonix.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf34217205---44277565632.pdfIn PDF document text
    • https://bdblue.com/ckfinder/userfiles/files/19501630751.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/rusofux.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/cc1a9aee3afe70c791144e64ec8ae9d4/zojanegiwefit.pdfIn PDF document text
    • http://dlmberatung.ch/userfiles/files/fiwilejonikiwila.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/5bab634e55d3d218bcbfe84c0e5369af/25968329002.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/89497237267.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b015d8925f0---voluxuzoseb.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/28055291424.pdfIn PDF document text
    • http://doggystylzgrooming.com/admin/photos/file/jizuk.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/88a636e41106631fa3051c8e730753a8/68050728866.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c654c07d856---miterugajikiwi.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c85504d6621---vojexegewisebo.pdfIn PDF document text
    • http://burchiellati.com/file_fck/file/gutotutoxidunipogefupalog.pdfIn PDF document text
    • http://www.polni.si/Images/files/webor.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/689e96356cb61a023efbab45ed2f3859/94410607589.pdfIn PDF document text
    • http://sziszolg.hu/editor_up/lujupuzubev.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/4963624810.pdfIn PDF document text
    • https://pasarant0g3l-turbo-h1t.com/contents//files/45035397802.pdfIn PDF document text
    • http://jjburgerut.com/uploads/files/61432195861.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=jazz+voicing+piano+pdfPDF 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_off0000d670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD670 10368 bytes
SHA-256: 4f22ac57486f1e856c38533ecffcc74a104ddc7f1cbc0d9577d83450ae3fdb3a
font_01_sfnt_off0000edd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD8 18348 bytes
SHA-256: 259684074f288e9c2010617c59f6009198771b8aa313f03878b4311e8c1984d3
font_02_sfnt_off00011c80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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