Malicious PDF — malware analysis report

Static analysis result for SHA-256 62e9cc13db6d241e…

MALICIOUS

PDF

78.9 KB Created: 2021-09-05 06:48:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4b1b554843fd37825ed4c745e66575d4 SHA-1: d0a159a09b5140de1d54eacf9aae545a08dd4da5 SHA-256: 62e9cc13db6d241e4b057359846469d2934da505c0e86637418f1b330418ddd8
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The PDF structure and embedded links point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://abugfreemind.com/userfiles/file/36956884344.pdf In PDF document text
    • https://uclerbaklava.com/resources/file/kijuwefi.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb23cc9e4e---nesakumukimuso.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/ufiop3i8cq67kako034vt33mq3/sodemavinogeveputa.pdfIn PDF document text
    • http://onlytech-tunisie.com/userfiles/file/zetinovisasubugebarop.pdfIn PDF document text
    • http://apismorava.eu/docs/rolokuxuzudit.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/50855135109.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/93521204024.pdfIn PDF document text
    • http://stpatricksreunion.com/clients/84553/File/gimujuta.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/25141313976.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/xikemukebisulibaxetewo.pdfIn PDF document text
    • http://tuhs1970.com/clients/a/ac/acc339db084e87cdfae31a76a6c96f1c/File/7613823598.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/jidepowogazodukaleposex.pdfIn PDF document text
    • https://weilmclainboiler.ca/fck_upload/file/6775144731.pdfIn PDF document text
    • http://officinedesign.it/userfiles/files/43545452030.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/dizawog.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/q68hpckqbfqiktdetrjsn2shb4/91839288531.pdfIn PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/punil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=openstax+statistics+solutions+manualPDF 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_off0000d199.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD199 17008 bytes
SHA-256: 3c0958bba8e47de28ca61428c092152d5771770b126b6897702b6324c7644212
font_01_sfnt_off0000fde2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE2 10664 bytes
SHA-256: 9e4b2a4c94e09d5c2dceb8d6479e351d0504538441ad31c947acf7c7a598eea4
font_02_sfnt_off00011662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11662 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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