Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7a2932112b09820…

MALICIOUS

PDF

101.3 KB Created: 2021-09-02 00:58:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 87cc263dc54b05ba526245c9c305e803 SHA-1: fe8ee9d8077862d2d1c8317aeafc7c259ae59ca2 SHA-256: e7a2932112b0982035e4e2c8d731352a3bc63882046d45dd72540f5232b397e7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing content but likely serving as a vessel for these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 http://akgikorea.com/file_upload/fck_upfile/file/34701922299.pdf In PDF document text
    • http://frankslawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/43602127357.pdfIn PDF document text
    • http://praconsulgroup.ru/pict/file/25324777836.pdfIn PDF document text
    • http://platcometals.com/images/file/88027464288.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/160744c1217bf1---47277311748.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/8297163395.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/davajokasusuji.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f77635390d---buripijagedotuzawo.pdfIn PDF document text
    • https://tlkingatlan.hu/kepek/other/file/nanipovuwuloxosupemo.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/suk43inan7661hp6pev85pjaub/57363390437.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210728015602127.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/zuwegimedigolobupikego.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a3438283d86---99153517609.pdfIn PDF document text
    • http://huiking.cn/uploads/file/282308435078.pdfIn PDF document text
    • http://4els.ru/uploads/images/files/83652650063.pdfIn PDF document text
    • http://exima.kr/userData/board/file/zekazobivivoruvedixupewur.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/g1qf0m1i6m4kcd7p0an7epcf57/83074589613.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a491d4f5a---zorojedepe.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/gsm25vf4h140pdfjl36j8ineq5/87003059197.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/394b402151590b07f4c0caf611f9e454/kimijafutujewegikug.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a90716c3c8c---59550705400.pdfIn PDF document text
    • http://tycoonmedical.com/userfiles/file/jebaworos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=clinical+electroencephalography+for+anesthesiologists+part+2PDF 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_off0001205b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1205B 11024 bytes
SHA-256: b1fcfb42a021f91ddc11dd455055fea09b03b6b61f3ec56b7bd8c4a3e9c79f48
font_01_sfnt_off00013a07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15219 20068 bytes
SHA-256: 1685ee3c0ece2dc96ce591e1a894501a15cb338ca338a039f835b5c7c5269128

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