Malicious PDF — malware analysis report

Static analysis result for SHA-256 85f4e966ebf83f6e…

MALICIOUS

PDF

68.6 KB Created: 2021-10-02 16:21:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: b4e8d58d15882b28867d61181e2bc339 SHA-1: 07b43ed676b83da250df1b520f3f5e1408181834 SHA-256: 85f4e966ebf83f6e7c745d1b2b465e5378a54b40e6194eaa0d2cf108049c89fa
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous URLs pointing to potentially compromised WordPress sites and other domains. These links likely serve to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/972dc604024fb1599f37a11f1fd1d2fa/fiped.pdf In PDF document text
    • http://healhumanity.foundation/userfiles/file/44085192782.pdfIn PDF document text
    • http://auswallendorf.de/userfiles/file/voboxugodurukudebosiper.pdfIn PDF document text
    • http://home-plast.ru/foto/files/88962414212.pdfIn PDF document text
    • https://bdprescription.com/ci/userfiles/files/70309606961.pdfIn PDF document text
    • http://www.ccengis.be/applications/ckeditor/addons/ckeditor/ckfinder/userfiles/files/67217848144.pdfIn PDF document text
    • https://penal-garazh.ru/files/buziperepimexox.pdfIn PDF document text
    • https://nstyapi.com/resimler/files/losujuxuterurasolane.pdfIn PDF document text
    • http://abwgulfport.com/uploads/files/jifitafuwadureloku.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/9f37f24e00f6fe19053e1ab7176de1b0/70256323595.pdfIn PDF document text
    • https://fsbulletsandbrass.com/userfiles/files/lederovedunolikaraket.pdfIn PDF document text
    • http://hatowo.com/app/webroot/uploads/files/widewajiwovo.pdfIn PDF document text
    • http://vanillasky-ch.com/images/files/ninexitasubazumepogofa.pdfIn PDF document text
    • http://zae.me/datafiles/file/besilenudoxusetor.pdfIn PDF document text
    • http://huyminhplastic.com/upload/files/41788084543.pdfIn PDF document text
    • http://torremaggiore.sitmap.it/files/files/madabekatadepa.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/15818377227.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/95565321121.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/h3vnekioq8bmebi4t9t08huh3m/nisujitag.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/pojov.pdfIn PDF document text
    • http://remont-m.com/userfiles/file/kenumidaxafezomivaso.pdfIn PDF document text
    • https://benmoonpharma.com/userfiles/file/zaboj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=great+pyrenees+puppies+near+mePDF 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_off0000acd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACD9 15164 bytes
SHA-256: 567694ef8b18f05c67ce1d67a28fee2e11a519a77b37bcd3bce4f6d2cb98dea5
font_01_sfnt_off0000d353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD353 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6A 10500 bytes
SHA-256: e3254a2e3e15abaafdb3cd1f962618394b06f6d309c0c94da06ce7eae0bfe7e3