Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f006e5e6eccff94…

MALICIOUS

PDF

76.6 KB Created: 2021-08-25 01:59:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a96155ed40e2897b7f052fbb8ee7b621 SHA-1: d9740fe7c58d42880091e201f6064e0c353001d4 SHA-256: 8f006e5e6eccff940d5081398c918ff08c6e9b3641f56b98ca1392d6e7fe353e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16078b718c564e---12620372617.pdf In PDF document text
    • https://progin.swiss/ckfinder/userfiles/files/jizolovadamome.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/47240015214.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/rutidemabirupisikise.pdfIn PDF document text
    • http://vanprodukt.cz/UserFiles/File/38186158582.pdfIn PDF document text
    • http://bebsulmare.com/userfiles/files/45042908692.pdfIn PDF document text
    • https://kingyao.com/uploadfiles/files/20210805_040513_8582.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16098769d530ab---lamidizovutu.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/57008674659.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/kokukolakodagusifagitut.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7381857cdd---nevagunikokuvivudim.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/15363c50655011ef267bb25fe8474c0c/63819617940.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/wibunisasesufozidofev.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/0e6a132a95289ee80543e86d60c2a10b/27840927818.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/r5af3jtk8nq6tcuj8fp21t4vbj/61114262002.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b98f4adee2a.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/gcb9mchofc6ni0cdpc75tnfqt1/watujisuse.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/rutegulasakupiwube.pdfIn PDF document text
    • http://osayit.com/images/file/78592122568.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/9dfd8e0f4f8ac6bc6038a1efd8fcfa51/30200244482.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb6b67ce63---kuzivifuzukogutawinu.pdfIn PDF document text
    • https://diphong.com/uploads/kuxeranaxebewijepiruv.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/xezikiwidewizajuw.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/40028106361.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/fd7c065416ba601d8eef3d13e2b7f6fe/besarixowejejugosobi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=is+1893+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_off0000ca51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA51 10456 bytes
SHA-256: f98eb7d6f1ef0f95e614a7879dc57b1f75791d73191bb0fafe91e41d74566e5a
font_01_sfnt_off0000e249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE249 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5B 16652 bytes
SHA-256: e699a3a830b7ff8e38bd5d80e9240a25181db6ef61546182dccb121ef1905742

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