Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e2bf0eb1bfed653…

MALICIOUS

PDF

93.4 KB Created: 2021-10-16 00:35:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 21ff77c78aa30e89552acbbfcc844eb6 SHA-1: f0052f5339370ae2d463d422c99e6f05d6f30578 SHA-256: 0e2bf0eb1bfed65329502b67989d9e9c01f645d7820221fb0c9343df57c0df88
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on potentially compromised or disposable domains. While no scripts were explicitly extracted, the nature of PDF link farms often involves JavaScript to facilitate redirection or exploit vulnerabilities, hence the inclusion of T1059.007.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://istanajp2.com/contents/files/5762072507.pdf In PDF document text
    • http://kleinschadenexperte.de/userfiles/file/86426628205.pdfIn PDF document text
    • http://entrackintl.com/uploads/33277147824.pdfIn PDF document text
    • https://holyfamilyhospitals.com/ckfinder/userfiles/files/dikajopujokakobemuvelu.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/6f4f9ef01255844bcfdbc2f6ecb50b5c/xunanajisaru.pdfIn PDF document text
    • https://beaszemin.com/files/52119834829.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/jasete.pdfIn PDF document text
    • https://pushtypathshala.com/demo/aims/files/images/files/nalejuna.pdfIn PDF document text
    • http://studiolegalebisantis.it/userfiles/files/91193969116.pdfIn PDF document text
    • http://boracayg.com/FileData/ckfinder/files/20211001_79B14C269582B0CA.pdfIn PDF document text
    • https://eklyps.net/images/file/46402997491.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/33huht4bbb3hsbnel68v3osnf2/20199349449.pdfIn PDF document text
    • https://healthlantern.com/ckeditor/ckfinder/userfiles/files/karaxu.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/vgs66jm5uidrkkmioki62j3bsr/vopekitejizojutopiges.pdfIn PDF document text
    • https://xn--72ca1bzcdf9cg5df4n5a8cei.com/userfiles/files/28677379341.pdfIn PDF document text
    • http://ordineveterinarireggioemilia.it/userfiles/files/kebijipujuj.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/fadaki.pdfIn PDF document text
    • https://patriciogaete.com/upload/file/pudovejaduxanabapi.pdfIn PDF document text
    • http://ecofincas.net/ckfinder/userfiles/files/75481375658.pdfIn PDF document text
    • http://ingpoggi.eu/userfiles/files/36290652217.pdfIn PDF document text
    • https://brihat-group.com/assets/userfiles/files/68426353335.pdfIn PDF document text
    • http://faisaltowel.com/survey/userfiles/files/6829652839.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/files/39664364411.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/6Zflnl449io/uplcv?utm_term=it+is+done+in+hebrewPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE536 21420 bytes
SHA-256: e1c80cfa4cf89b63cc0da780343979c4fca643a1dbf786f37f06fffa2b5bbbef
font_01_sfnt_off00011cc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000134d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134D4 17856 bytes
SHA-256: 7255ae337928d93913352ba9d0607da4d9c1dc167838d0bda971015089901bf1
font_03_sfnt_off0001509a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1509A 10316 bytes
SHA-256: 5ccc6e763065738ec5e092448cf3ac3692be03ef72f181e1e207667d6d5b677c

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