Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe386dad925ef967…

MALICIOUS

PDF

77.9 KB Created: 2021-08-27 18:24:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e968f8fad10189cac9f2728f64ac84f3 SHA-1: f6d6d3ab5349cde0955bf70c965ebbf7883202a9 SHA-256: fe386dad925ef967acf5cd989b478e28b3aa7dffccacbb4780c0c8da8a2af2be
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the structure and URL patterns are consistent with a malicious PDF designed to lure users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://philabc.ru/uplcv?utm_term=why+did+you+decide+to+become+a+teacher+answers PDF link annotation
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/88fcd5be600a7b57ddff24265913f9e1/25121918199.pdfIn PDF document text
    • https://broodjedenbosch.nl/ckfinder/userfiles/files/37948033589.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/edc072f7ad7905ff916ce62ff5a25a07/wejujarosetesugekinomuxex.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/0ff6bfeee959beb2cc65afd4bc1f0f79/sinipozubozaxikagoji.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/vebiz.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/l06gv4fu56pno7r8juur9shub1/volakaram.pdfIn PDF document text
    • https://airflow-skateboards.com/userfiles/files/82910469676.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/kiwirugefibosozevudi.pdfIn PDF document text
    • http://thedreaminitiative.org/Content/Admin/uploads/files/gevigitupipano.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///jetif.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16091be8e6f369---gixizarudenigagu.pdfIn PDF document text
    • http://videocycling.info/files/file/29286401952.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/mezanutesa.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/0ov99itgf591gh1erclh5jbcm6/51396044113.pdfIn PDF document text
    • http://springhs1988.com/clients/a/a7/a70db2535ed58991dd9724faf9b165d0/File/82274669627.pdfIn PDF document text
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/namemagidejudenulijixixub.pdfIn PDF document text
    • http://nhatngungoisaoxanh.com/upload/files/62654024785.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/f38bd71d693e701b3770662026184b03/63162713347.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160c3ce66ad50f---nasobe.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160772aad2c89f---sozegovoweroxarete.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3q92qu87gntcquuiea0lkdr8v2/muxonovusunise.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/purerodimedosopexem.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/kojakoletafonapesif.pdfIn PDF document text
    • 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_off0000cdf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e60d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE60D 11020 bytes
SHA-256: ebe68e0d9dc0c33a18571eefb12a90bc353c1cf8b1c3bf9600fad78255e4c37e
font_02_sfnt_off0000ff8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8C 16312 bytes
SHA-256: 8e6383d4bd200b4ecbafbd1d933338eaadb0c7a8e933423bcb5d3384504126fe

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