Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef9f8845e31242e2…

MALICIOUS

PDF

87.4 KB Created: 2021-07-16 22:22:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4dca6e4a4827482d42864b869f6309b1 SHA-1: 3fc435a473e0172c265036571b9a3954b1f305c7 SHA-256: ef9f8845e31242e26b03f37d56884d60453742827b90209e8a99156a15886311
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

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 compromised websites and potentially disposable hosting. The embedded URLs, while some are marked benign, are part of a larger pattern of redirection, suggesting an attempt to deliver a malicious payload or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cebb9584f30---vejub.pdf In PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc66ddb792---jelikigubawele.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16092af5b7c7ab---16667213527.pdfIn PDF document text
    • http://bronia.org/userfiles/file/54001335391.pdfIn PDF document text
    • http://cherryontop.pl/upload/fotki/file/muvim.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/81690597297.pdfIn PDF document text
    • http://kerrya.com/ckfinder/userfiles/files/41125531593.pdfIn PDF document text
    • https://studiovizia.com/webroot/img/content/files/12347314075.pdfIn PDF document text
    • http://siembra.me/uploads/files/53582481412.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b40cf54b2b0---6068021465.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/42071514367.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/40on16il4n5hk8ureegh01hj4e/80418631313.pdfIn PDF document text
    • https://aaaxxion.info/images/file/15912505321.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/3a76c381bb13ae66ca16432bfdad9faa/94770795477.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/lujexolamipedepemeviz.pdfIn PDF document text
    • http://debden.org/userfiles/file/99621941839.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/noxobeve.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/2cc1f1cbce771f54b1340110c718cf98/sefig.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/xerawofobevonapesite.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/cbda38aa9ef2470365d679fd4cd01f41/zikubiwuwa.pdfIn PDF document text
    • http://smartraoptics.com/fck_filemanager_upload/file/nagopazosed.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/f24c1603f5c94f38483256afb0c22ab3/8713758079.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=sure+3+odds+daily+freePDF 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_off0000f197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF197 17696 bytes
SHA-256: 77906744fdbac2a46c8775f6243ec636a975ecd68ee14855e8e1ba0c7f0ce6bb
font_01_sfnt_off0001206f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1206F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13886 10604 bytes
SHA-256: c21ba5b196a476db6cb61a82b43c96c7a083db40a4454c32af810da9db9cbfc6

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