Malicious PDF — malware analysis report

Static analysis result for SHA-256 868fa8421b8bc0cc…

MALICIOUS

PDF

86.5 KB Created: 2021-08-14 18:55:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d8afd45fea9a06c6d816133bb0e70d03 SHA-1: 5869787c63409061f1de35de276de171256d7d88 SHA-256: 868fa8421b8bc0cc947c6fe173bc93b55b44266c7ee54270552e79801a96640d
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised websites, many of which host other PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for SEO poisoning or distributing further malware. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt to manipulate search engine rankings or lure users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://toyotaautobody.com/ckfinder/userfiles/files/polepinefolosipukitazo.pdf In PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ee2baf56f8f---saripusepemilosugiwida.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607226220a945---87175208668.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/3af31994b28f5f716d7cfcd25ba91ccf/fuvabefodigadobudewe.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/90804603721.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609700d6cb53f---54476045308.pdfIn PDF document text
    • https://livredart.com/ckfinder/userfiles/files/19027717570.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/12971177821.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/t1tgarhkgl0oc8rd47kk6q1rj9/napukesepo.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c1a426ba5---29326190543.pdfIn PDF document text
    • http://sehs67.com/clients/e/e0/e078d4d0076166a7bb489ca3b3a583ab/File/dozok.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/d855035b57d37c0a7b20b430d527de05/71141994665.pdfIn PDF document text
    • https://tyeetomsfishing.com/userfiles/file/51749612146.pdfIn PDF document text
    • https://manualismedicina.hu/fileok/file/11768180779.pdfIn PDF document text
    • http://ukicda.com/admin/fckeditor_upfiles/file/2021061319500780554.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/sokuwilomavizeregotifujov.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/7i8l916ls3rveoa3h2nu0cel11/30473484792.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b636262ba1---82268995421.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/8ee822984341cf2742f241f17b8b96c3/wijadasok.pdfIn PDF document text
    • http://hanleyresources.com/images/relagezuvuxuxemonexu.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/kunagap.pdfIn PDF document text
    • http://rotarylaspalmas.orgdocumentos/file/68769854259.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/8a1947b60edb0b4ac62ada1e6df92791/folopo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=tasty+blue+game+unblockedPDF 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_off0000ec06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC06 17260 bytes
SHA-256: ec5f94030f58050af1d349ee202562b6822ec2181b5bc71846afd6a3e81fb388
font_01_sfnt_off000118c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118C9 10932 bytes
SHA-256: 8f1e91f3f2ea080d65368e5b89b1c820281e9906eef69e1de16393f43bff628e
font_02_sfnt_off00013200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13200 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1