Malicious PDF — malware analysis report

Static analysis result for SHA-256 38f3ba014b80a3c6…

MALICIOUS

PDF

80.0 KB Created: 2021-07-16 01:22:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: a9793cfa778eb786e1a31bd39a383865 SHA-1: 10bfe871e278d098d162cb74a74dabb163081a6c SHA-256: 38f3ba014b80a3c6c2d79a2e22cda2328c3fa6b71b08df3b0c9a72edc0370a66
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, but the structure and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a7eff635a9a---37373766568.pdf In PDF document text
    • http://banphimchuot.com/userfiles/file/rekirox.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/ef2a5710b1a84d40a8364a3386c104cd/89242898556.pdfIn PDF document text
    • http://ogcdc.org/uploads/ck_upload/files/xekimunemujisizigu.pdfIn PDF document text
    • http://oilmachineydy.com/d/files/goronusabofewilosegurewes.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/xagorusopobosixo.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/92596b6d57d6a80fb2187fa9623d3c0d/99351647375.pdfIn PDF document text
    • https://barcelona-health.com/files/galeria/files/24518514372.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/1963f3bb002eecfe631f256333f8fc22/jutoful.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/misibuninapijazikula.pdfIn PDF document text
    • http://skyline64reunion.com/clients/e/ec/ec378541aa9b73e2b99de5ca5545ec21/File/jotomotaxemodija.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b4c310a27bf---paforobomodizibig.pdfIn PDF document text
    • https://bosgo.mn/uploads/files/43185022318.pdfIn PDF document text
    • http://juha.be/_files/file/gufuduzemi.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080351d2993e---55841129147.pdfIn PDF document text
    • http://www.moyekolodin.com/files/69721308635.pdfIn PDF document text
    • http://fongyoskert.hu/userfiles/files/66369990108.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/25465629513.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/wefepuvolanewadopiviwoluv.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/bvt2jnvppkv77rjvfh98flas19/94906447163.pdfIn PDF document text
    • https://keralahappyjourney.com/ckfinder/userfiles/files/muwupavuluzu.pdfIn PDF document text
    • http://perfekttorun.pl/pliki/putogegizusabixut.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/8vm9ld02r72srnvk8q8r6aqlve/kokijater.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/2910547903.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/68861577488.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=mm+to+m2PDF 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_off0000d678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD678 18444 bytes
SHA-256: 775bab31cdd6b116772a7d7bef99dae23ab8e38f6f9eb332ef9d5dfbc04f46ed
font_01_sfnt_off00010630.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10630 9576 bytes
SHA-256: 4380afec4e47d974f2f95e309708eefbea88b843a440f3cd922a32600f54f171
font_02_sfnt_off00011af0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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