Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0812dd938086f0a…

MALICIOUS

PDF

82.7 KB Created: 2021-09-20 15:54:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fd2297f4b622743436b1cfee633ccc61 SHA-1: 066f73ec82c0fe14bc15639f3bae8d284b516ba0 SHA-256: a0812dd938086f0a04e2bc21874272789e05322d5d6d0865b021fddb71b1c760
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://pixomot.ru/uplcv?utm_term=download+reels+in+instagram PDF link annotation
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dce788b5ab---6005727086.pdfIn PDF document text
    • https://mimzyonline.com/userfiles/file/bukolesomerugoj.pdfIn PDF document text
    • https://siltri.com/fck_upload/file/54087507545.pdfIn PDF document text
    • http://sport-zavora.cz/data/file/tumedetobodale.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/243be85a0c4018f4945c9ad59b5afc8c/gevekovafidetiwod.pdfIn PDF document text
    • https://pmrmhss.com/userfiles/file/jojefanukaniwetasa.pdfIn PDF document text
    • http://kqcme.yiaiwang.com.cn/upload/files/reveniril.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/68456557419.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/50265361966.pdfIn PDF document text
    • http://msdoubrava.cz/foto/images/file/49046382245.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///94264644615.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name/files/mivuvunuwuzom.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/fujewuwetotokodozole.pdfIn PDF document text
    • https://promise-land.com/upload/file/wetokebukuvuxukisad.pdfIn PDF document text
    • http://mayphatdienngocquang.com/media/ftp/file/40224900628.pdfIn PDF document text
    • http://hattingtoemrerogsnedker.dk/userfiles/file/49683211039.pdfIn PDF document text
    • http://chelseafoodmart.com/uploads/files/7376027882.pdfIn PDF document text
    • https://tranthachcaodanang.com/uploads/image/files/siperegizulewuvodexigim.pdfIn PDF document text
    • http://fra2ange.it/userfiles/files/82319659391.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/161394cca3c694---32128652207.pdfIn PDF document text
    • http://idominjazz.com/fckeditor/userfiles/image/favaterawiwunar.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/68801006352.pdfIn PDF document text
    • https://thefertilizergranulator.com/d/files/37878299841.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_off0000e0ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f916.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF916 10680 bytes
SHA-256: 197d664304d29e89da23b9c587f05563ef111f010b30bc2035733ebc60455a79
font_02_sfnt_off00011163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11163 16912 bytes
SHA-256: 9b39fd284eb6ce311c6396b7b29f4effbc70b8212f52fe97a3c9b777878d3b4b

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