Malicious PDF — malware analysis report

Static analysis result for SHA-256 df065edd5770d7f6…

MALICIOUS

PDF

76.0 KB Created: 2021-08-11 19:18:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c3395692afc6a70d93e70a5be1aadd44 SHA-1: d6bfccd05bdfd987e318c362c46dac694c7061d3 SHA-256: df065edd5770d7f69d74ad0a2f72531cbd8e34c7e554a2e1cb00dd49aa1d71f8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised websites, many of which host other PDF files, suggesting a link farm designed to distribute malicious content or phish for information. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the structure and URL patterns are consistent with phishing and malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/8d864b1d5db775cbdce29675fb9c5d29/81330601630.pdf In PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/9887217719db61a4729f4f8c6e52d633/poziviguwoxejumokus.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/cbc5145fe93201d5ba19c5ffecaba8f6/birovumosupuju.pdfIn PDF document text
    • http://neonyazilim.com/images/Media/files/32163487096.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/81412797174.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/k3af2rs1dpbmuq415blr1f2008/tenobipulas.pdfIn PDF document text
    • https://biovuspharma.net/userfiles/files/58399402593.pdfIn PDF document text
    • https://uclerbaklava.com/resources/file/rimiritoseliwonu.pdfIn PDF document text
    • http://artstudiodesign.it/userfiles/files/mikujujedomamuxuse.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16098768d5c19e---55744542242.pdfIn PDF document text
    • https://www.tanyadantus.com/wp-content/plugins/super-forms/uploads/php/files/f2cfb8a9d9e0f584e21fded383523328/duruwojivak.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2e98c6dfb---34985671902.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607169b12d1c5---keteguxafekedatukut.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd6467911b---tawegula.pdfIn PDF document text
    • http://fanti-fitness.pl/uploads/assets/file/kabixadimavifozopuduju.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cb36cc8d2---rufupija.pdfIn PDF document text
    • https://xn--80aanugxqi.xn--p1ai/admin/ckfinder/userfiles/files/xowiwemax.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a3cfe0c3735---sigigupewerixufoparifapaz.pdfIn PDF document text
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7690c1405---68104159316.pdfIn PDF document text
    • http://stigstudiotecnico.it/userfiles/files/vagumepetolazevisisid.pdfIn PDF document text
    • http://digjamaica.com/app/webroot/files/musasataxemajilawoduw.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e17489614f---8238510034.pdfIn PDF document text
    • https://angelsforwarriors.org/userfiles/files/45156662272.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/tudoduvupasefotipijiwawa.pdfIn PDF document text
    • https://balustrady-metalik.pl/files/20149087876.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/39227412772.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=evaluating+numerical+expressions+with+exponents+worksheets+answersPDF 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_off0000c468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC468 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC7A 16320 bytes
SHA-256: 58f4a0238d7707a80602e44cccbe396056a2be31f9aafbb97453d91e487b11d6
font_02_sfnt_off000106be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106BE 11252 bytes
SHA-256: 7a82d472f36788699d2db0de3b3cdc004358eef287287ac4d4f7f9b056506b4f