Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e9e33d61787e546…

MALICIOUS

PDF

80.2 KB Created: 2021-08-13 23:28:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8d82b381913dd71550e9e2515c6d2410 SHA-1: f1b2661e1fe9e2e156d3801de57eab47b307adee SHA-256: 5e9e33d61787e546be096bdb1d307b24ec55aa14b3a34d865e6d91230228ec89
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains a link farm pointing to numerous PDF files hosted on various domains, suggesting an attempt to distribute malicious content or phish for information. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://seamcc.com/UserFiles/files/fikinemevifazodiwupuf.pdf In PDF document text
    • https://egyptsuntours.com/userfiles/files/29302605115.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/39284717824.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/41ab832f13a140f4c90f1dce10e5ecee/zadesavubagit.pdfIn PDF document text
    • https://consultingexpert.eu/fckeditor/userfiles/file/jotapalogenupajexobubesol.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/lujeruxakalagirokifu.pdfIn PDF document text
    • http://farashimirooz.com/files/libikevofezeninurirekivas.pdfIn PDF document text
    • http://limuzine.md/userfiles/file/50976087848.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/39657212703.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/0aa702e7c20861991be74553fc906f5d/35874937124.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2b29766d8f---dadunobidabojoxove.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160799a1836683---totekefagula.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/1160308890.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/6cdece1196bc5e4eb4899665209c90ed/wuzerem.pdfIn PDF document text
    • http://izumrud38.com/ckfinder/userfiles/files/dikofokadoduvutexoxatesip.pdfIn PDF document text
    • http://www.hz-kontejnery.cz/ckfinder/userfiles/files/86988026555.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/jilexidutariretiki.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/fudidenuriwamolifaga.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b55f4acc5ff---zumutufukitite.pdfIn PDF document text
    • http://palenice.net/obrazky_clanky/file/nomufamaxalagogilumi.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087d34f228f4---1768153883.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=mcpe+one+block+skyblock+map+downloadPDF link annotation
    • https://mediaget.com/userfiles/files/mebejawejamolupavobunajob.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_off0000d530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD530 17040 bytes
SHA-256: ada169eef5f2b185dc64399377b1bc31d2373d6a85b67f936130ab19260a12c7
font_01_sfnt_off000101ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101AD 10808 bytes
SHA-256: f8c5a9dc8600ff7632b91f14f3f99e35c6700e4767835ccdc8218613da4c2f01
font_02_sfnt_off00011a70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1