Malicious PDF — malware analysis report

Static analysis result for SHA-256 684df2f55fd48944…

MALICIOUS

PDF

83.6 KB Created: 2021-09-20 13:10:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3b4e2cf5e456c1cc93603db04d6d3874 SHA-1: 35c9cd5112bd331e2f19f64e3406518004572972 SHA-256: 684df2f55fd48944f13309f7b9095cdaa7de463a1628a195f3f5ad2902a7cf00
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links pointing to compromised websites and link farms, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links are consistent with attempts to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://truongthanhco.vn/webroot/img/files/18695278989.pdf In PDF document text
    • http://mtkshop.com/images/uploads/file/25387491957.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1612f144b09d91---55337273910.pdfIn PDF document text
    • http://ideatity.com/ckfinder/userfiles/files/wusuxikifiwuparofojanatu.pdfIn PDF document text
    • https://mrdak.cc/uploadfile/files/wusumetatuja.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147ec23d6aca---84615598506.pdfIn PDF document text
    • http://bourgogne.annuaire-regional.com/ckfinder/userfiles/files/tijemejajisugopuvibe.pdfIn PDF document text
    • https://avistravel.activsport.ro/userfiles/file/84787611394.pdfIn PDF document text
    • http://huichem.com/ckfinder/userfiles/files/28035180407.pdfIn PDF document text
    • http://bdn10.cz/files/file/wegifalaxejudupiv.pdfIn PDF document text
    • http://studioriboldi.eu/userfiles/files/34380274734.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/napawadirunorodofubumen.pdfIn PDF document text
    • http://machulski.com/public/file/nasizitixakab.pdfIn PDF document text
    • https://wyslijpaczki.pl/app/webroot/files/userfiles/file/59011355153.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8bab5f6cd---4103240082.pdfIn PDF document text
    • http://ibnuaffan.com/ckfinder/userfiles/files/jepumuwawafexesak.pdfIn PDF document text
    • http://biirbeh.mn/images/content/file/vasawobupad.pdfIn PDF document text
    • http://pataibicaj.hu/userfiles/file/gijaluxotewivawugusemere.pdfIn PDF document text
    • http://upasamed.org/Content/uploads/files/69875768425.pdfIn PDF document text
    • http://xn--80adpfaaeictf0c6c7i.xn--p1ai/public/file/molesoz.pdfIn PDF document text
    • http://hasomedia.com/userfiles/file/nofok.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/22466425710.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/19g7jqsqov8ae0uaqbcfbtg0su/57775986405.pdfIn PDF document text
    • https://3eyamaichi.com/upload/ckfinder_temp/files/20210912194903.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=2020+offline+games+for+androidPDF 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_off0000e0e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E1 18228 bytes
SHA-256: 7a524359099afd4cfdd0620bef5574365d3e4443e56e98c20db8a899fb996d22
font_01_sfnt_off00011017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11017 10744 bytes
SHA-256: 761b6a8de439b9cfc25da4c61a1124deea27592a17bea858c5afa95225bb13c3
font_02_sfnt_off00012887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12887 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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