Malicious PDF — malware analysis report

Static analysis result for SHA-256 e79d829786d8336b…

MALICIOUS

PDF

76.3 KB Created: 2021-09-17 17:21:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3784a0f865286091243f0490b00891f8 SHA-1: 36d6bd1f6049689d8d5934f2bade55672b5cb0a2 SHA-256: e79d829786d8336b2949a695a33725fdaa324a9bb265d959c4d4a509d4555425
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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 https://jfava.gemwareserp.com/userfiles/file/90815961843.pdf In PDF document text
    • http://aaaexpressheating.com/userfiles/file/20939563765.pdfIn PDF document text
    • https://kligi.viart.lt/ckfinder/userfiles/files/xoxujudupife.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16130205ac82dc---wukixomom.pdfIn PDF document text
    • https://ever-progress.com/upload/files/giramiget.pdfIn PDF document text
    • https://mudraconsultancy.com/uploads/files/23526798751.pdfIn PDF document text
    • http://elistaprezentow.pl/userfiles/file/begito.pdfIn PDF document text
    • http://ottuk-e.org/userData/board/file/talusokujuwuwesoji.pdfIn PDF document text
    • http://parmalab.it/userfiles/files/babakupatasomawofut.pdfIn PDF document text
    • https://www.aledrukujemy.pl/ckfinder/userfiles/files/10069243725.pdfIn PDF document text
    • http://cartopack.be/Images/file/97676812597.pdfIn PDF document text
    • https://aurorabersinar2.com/contents/files/87332389905.pdfIn PDF document text
    • http://speckrepej.com/upload/file/loxarawog.pdfIn PDF document text
    • https://llbyggodesign.se/UserFiles/files/99352637815.pdfIn PDF document text
    • http://alpinedelhi.com/userfiles/files/totenunibatalu.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/fitusetuwun.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/161335c5c4eb73---46128793399.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/31004479687.pdfIn PDF document text
    • http://meta-min.com/files/kuninibulaporola.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/5470bf2c1c6cbd5f346ebb9881a295eb/1544232828.pdfIn PDF document text
    • http://wadirumshootingstars.com/userfiles/file///98965583382.pdfIn PDF document text
    • https://grupa-energia.pl/attachments/file/71836277164.pdfIn PDF document text
    • http://balaton.varosom.hu/userfiles/files/29487616860.pdfIn PDF document text
    • http://sowa-architekci.pl/userfiles/files/26875911985.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/zasujupedugidolabebifa.pdfIn PDF document text
    • https://bangprice.com/bangprice.com/beta/cms_image/file/luguretopazidotavumibiv.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/i8sph46e8d1itjsf04ta49lgkp/65598932057.pdfIn PDF document text
    • http://showdoimovel.com/files/files/44413801793.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=best+offline+voice+assistant+for+androidPDF 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_off0000c681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC681 17204 bytes
SHA-256: 099a8abec5451f991847fe5bea19dd4d42c71a0f2f066b3dbc5685508ee2f99f
font_01_sfnt_off0000f2d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D1 10588 bytes
SHA-256: 24dfdc2472d48ce79fbc6867abbcb711674a99a185dc6842a1f6ebd210ace9a9
font_02_sfnt_off00010b30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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