Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a567e33c11a3816…

MALICIOUS

PDF

82.1 KB Created: 2021-09-20 21:51:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c6ea39f791784c3a9dbc2d09048c199a SHA-1: 2bc3b8d0b3d2605e4b1b5ab9c37d21b08b28e584 SHA-256: 5a567e33c11a38168d6fa256a08173953b312bfcd245305571b1ea8c69c45720
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The file's structure and link farm behavior align with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://poexali.org/static/image/_u/system/files/pubumovoforenuk.pdf In PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/vozudebamigowog.pdfIn PDF document text
    • https://goacetours.com/ckfinder/userfiles/files/juviwajemiliminopuwopuv.pdfIn PDF document text
    • http://newgrids.com/userfiles/file/fokobatigulaw.pdfIn PDF document text
    • http://maivietnamesecotati.com/uploads/files/jasumonitizane.pdfIn PDF document text
    • https://rlmahtani.com/userfiles/files/93419539732.pdfIn PDF document text
    • https://wita.lt/images/files/14463464874.pdfIn PDF document text
    • https://www.khaosanpools.org/ckfinder/userfiles/files/80472761080.pdfIn PDF document text
    • http://abwingssuffolk2.com/uploads/files/gijijiwaziwexifigeson.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/16134139024d77---roxobinogo.pdfIn PDF document text
    • http://gro-felix.si/uploads/miwafojozinotepufa.pdfIn PDF document text
    • http://khojedu.net/userfiles/file/21231423146.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/40193772438.pdfIn PDF document text
    • https://biomisszio.hu/tmp/rizemaganudijubaporez.pdfIn PDF document text
    • http://goldenteriyaki.com/uploads/files/jemonumasuv.pdfIn PDF document text
    • http://shiraz.sk/ckfinder/userfiles/files/4727554825.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139b5aecfb5e---tipenelowosewajavigewusef.pdfIn PDF document text
    • http://optometrystaprzemysl.pl/userfiles/file/87216940952.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/vijagizidotodezes.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613531351299e---94481837272.pdfIn PDF document text
    • http://architettipassarinmarzotto.com/userfiles/files/jutomejenasenibunudekot.pdfIn PDF document text
    • http://kvarkeno56.ru/userfiles/file/zubolezajaxedu.pdfIn PDF document text
    • http://www.lasallelille.com/admin/ckfinder/userfiles/files/61425910562.pdfIn PDF document text
    • https://samsungklimalar.com/upload/ckfinder/files/lokenominevilezoregez.pdfIn PDF document text
    • https://www.multilandtours.com/assets/ckfinder/userfiles/files/36222581310.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=i+keep+seeing+444+everywherePDF 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_off0000de72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF689 10492 bytes
SHA-256: 2cb7c2b9a1ebd3c81d9d92b17d1fdc83f24436ae232ba3b25f881ab428ad3509
font_02_sfnt_off00010e69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E69 17044 bytes
SHA-256: c18608d7665e5a64f6ab67ff8d8fcd62c93732773772662e77fa3de0a5b9c8a6

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