Malicious PDF — malware analysis report

Static analysis result for SHA-256 81015ab6adc30f80…

MALICIOUS

PDF

66.5 KB Created: 2021-09-09 07:06:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5a212c8a6fa64308959b91801b485bbf SHA-1: ce01dbeee88c22ef3c375be58e4c4e41e469c08f SHA-256: 81015ab6adc30f808cc86572f75b9a5339f14b3ce88b33c516c9058b9fbc5ac9
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 are part of a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of external URIs and compromised CMS upload links suggests an attempt to lure users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://cappellastudio.it/userfiles/files/memapovigoperi.pdf In PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/toxejurasegatesatu.pdfIn PDF document text
    • http://yongchengtech.com/uploads/files/202109050508157875.pdfIn PDF document text
    • http://shortguycentral.com/ck_uploads/files/nijupubokumix.pdfIn PDF document text
    • https://spitalmoldovanoua.ro/ckfinder/userfiles/files/55854028543.pdfIn PDF document text
    • http://statsale.com/data/upload/ck/files/68943638064.pdfIn PDF document text
    • http://studiocalderini.it/userfiles/files/zajip.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/a7hfs0re368d8knpk20rkb2okh/25813625974.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/f6a1jgerko5psgf26nvjmqniu5/nogugawepopu.pdfIn PDF document text
    • http://garderoba.sk/images/_file/64069778935.pdfIn PDF document text
    • https://emartdeko.pl/galeria/file/54940920176.pdfIn PDF document text
    • https://afgventuregroup.com/cfiles/file/witarufedagotewirim.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613760c36fff5---firoganofaboderekenok.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/sanabexenegijawidodejudo.pdfIn PDF document text
    • http://cissi.it/userfiles/files/30859657703.pdfIn PDF document text
    • https://crmsaas.dswip.com/ci/userfiles/files/38787512923.pdfIn PDF document text
    • http://uts.edu.co/portal/app/ckfinder/userfiles/files/kumow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=there+was+a+problem+parsing+the+package+smart+tvPDF 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_off0000a798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA798 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000bfaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFAA 14300 bytes
SHA-256: 26a3ec6d83b597ba80e13c90a546c6227a55605464c04bf7fb0341873c4263f7
font_02_sfnt_off0000e320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE320 11168 bytes
SHA-256: 88babbcacfe951919f481c39a3313e2e79b70265a01bee60cab453c4bffb974d

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