Malicious PDF — malware analysis report

Static analysis result for SHA-256 77308d5643a21795…

MALICIOUS

PDF

85.8 KB Created: 2021-09-04 22:58:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8b249562a4f3a892cc710d0cdbceb724 SHA-1: 7e9583a5b3569ef94dca1411bf4b17925f7f4a54 SHA-256: 77308d5643a21795e47507c1e258e0f54df55c9c1a96414c43568fc310ce92bc
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ML classifiers and ClamAV as malicious. The 'SE_CALLBACK_LURE' heuristic indicates it's designed to trick users into calling a phone number, likely for a scam. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's part of a phishing campaign, potentially leading to further exploitation or credential theft.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://asavn.vn/uploads/userfiles/files/65122679237.pdf In PDF document text
    • http://dailymaytrogiang.com/userfiles/files/rakur.pdfIn PDF document text
    • https://daynexweb.com/upload/ckfinder/files/29901029825.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/ro3e7mulq7ma9k20ore1t8p00m/rufuge.pdfIn PDF document text
    • https://saam.vn/images/content/file/lozegorudom.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/e9bfaj0aumfavghh46tbb98m5b/wolusotobek.pdfIn PDF document text
    • https://chuyennhakienvangvn.net/upload/files/xevitavukuxipisu.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3cb5c26c3e---92238465004.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/15008804105.pdfIn PDF document text
    • http://www.css-jp.com/upfile/files/2021/06/28/livunumimunijugapuv.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abd9818a0c8---58645011152.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/1bbd4bd3cf6a16a2d5cc07c3430a43ce/25952887735.pdfIn PDF document text
    • http://magogaralbamoble.com/galeria/files/51155051420.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd74fb3c00---mevevalexax.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16088b682ab147---zuziba.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/nie0bci66tdeoul37bfibd3dv3/kugaloluzame.pdfIn PDF document text
    • https://huaienclinic.com/uploadpic/files/35792652885.pdfIn PDF document text
    • https://elektrona.cz/files/file/81492669191.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/u6avu9u8s8mfkg8itnk9s8v488/loluvugudu.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/2e9b2ef14e214ada7387646871d6a4e1/5155122565.pdfIn PDF document text
    • http://hotel-ambassador-nice.com/upload/files/lemegaxilume.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/kubawesarefif.pdfIn PDF document text
    • https://on-call-anatomist.org/ckfinder/userfiles/files/45868826806.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c059dfb6796---61712657763.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=katakana+stroke+order+pdfPDF 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_off0000ebd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD6 10436 bytes
SHA-256: f1c0c95cb548c1a7d1e43cff41ee43a36e6c3765b164669d37efb5ae22bded35
font_01_sfnt_off000103ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103AB 17788 bytes
SHA-256: 6fc6b6b8064d6bea056afe873d83927580b1e53aa0869794d1d4502f3a2714bb
font_02_sfnt_off00013209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13209 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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