Malicious PDF — malware analysis report

Static analysis result for SHA-256 86c706e2ea51e717…

MALICIOUS

PDF

84.2 KB Created: 2021-09-17 23:50:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 70d5e8543c8063996654cd71a1319583 SHA-1: 6427e263c0671092991d3602c83779c2d0c19241 SHA-256: 86c706e2ea51e717f5a571b3c88507278cae1f1f1110217970f2f15867e63d4a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it's a link farm hosted on compromised websites, aiming to redirect users to download potentially malicious software. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the PDF structure and URLs point towards a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://bishopsalamatkhokhar.org/userfiles/file/64103459694.pdf In PDF document text
    • http://www.lbtfilm.com/uploads/files/17727215791.pdfIn PDF document text
    • http://m3hotels.com/userfiles/file/25615273638.pdfIn PDF document text
    • https://eventaipei.com/upload/files/53122075384.pdfIn PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jidotusafigogazusures.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-9/file/rufofadalidebid.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/f04a5908225d3a5dbe67941058b4358e/fobebogisedu.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/7ouf1fe4sh2ts34r5084122830/35737756567.pdfIn PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/xobamawuberidud.pdfIn PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/43499000651.pdfIn PDF document text
    • http://pk.mo/userfiles/file/sefove.pdfIn PDF document text
    • http://sbstroy53.ru/img/files/xetipodabu.pdfIn PDF document text
    • http://vaithun.net/upload/files/72438420071.pdfIn PDF document text
    • http://placc.info/up_image/60992523487.pdfIn PDF document text
    • http://jmyhship.com/uploadfile/files/mejidatodepujifopojitil.pdfIn PDF document text
    • https://biocoils.com/img/file/79894366198.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebe1c411a5---92876436640.pdfIn PDF document text
    • http://lahma.pl/_u/userfiles/file/xogojanetoluxojono.pdfIn PDF document text
    • http://gandolfiarchitetti.com/userfiles/files/pukiburinebeketimid.pdfIn PDF document text
    • http://chayka-svg.ru/files/62651412907.pdfIn PDF document text
    • http://himalayakebab.irafbrothers.com/shipinc/userfiles/files/45759208788.pdfIn PDF document text
    • http://nanoscopy.ru/uploads/files/juzexu.pdfIn PDF document text
    • https://alkirbilaw.com/userfiles/files/siripegenede.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=download+hyperion+launcher+pro+apkPDF 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_off0000e0e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E3 10740 bytes
SHA-256: 9a4420ef5f323ad0e187dd85718c14ee45409981c1d7317411d42b769208272f
font_01_sfnt_off0000f97f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF97F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11191 19240 bytes
SHA-256: c1affc50acfd70b7f0d35188eaa80dc25cd0bb207816e2d8a56a4992d7b57d0d