Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a2037045b63ef54…

MALICIOUS

PDF

71.9 KB Created: 2021-09-01 18:34:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 40d1d365fa4cecc1d261b8e906c3d78b SHA-1: 91b93133b60fdd0601e3dbfba5ffc7cccfeda786 SHA-256: 8a2037045b63ef543974652cc481d68e9f1e578b3e9d36263da8452957e99d4f
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, and the document body was unreadable, but the heuristic firings are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160b20b8f92eb7---nirukokok.pdf In PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d914e892c---95358333258.pdfIn PDF document text
    • http://ck-buhgalter.ru/userfiles/file/82489466339.pdfIn PDF document text
    • http://hkt-optics.com/hkt/images/userfiles/file/46773938696.pdfIn PDF document text
    • http://chrisdepanneservices.com/Sites/cds/files/64290066300.pdfIn PDF document text
    • https://prestinieurope.ch/userfiles/files/27419402285.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1607d09077e6e6---70030014719.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/63600393312.pdfIn PDF document text
    • http://bennett-legal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/guvozevazijezewusukef.pdfIn PDF document text
    • https://oncallanatomist.com/ckfinder/userfiles/files/malav.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d63e8de4a2f---vasobunulelisukitimadiw.pdfIn PDF document text
    • https://leanuslab.com/UserFiles/file/dupim.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b77e4ead1b0---gibivawudemolanerogefe.pdfIn PDF document text
    • http://safarekhoob.ir/basefile/safarekhoobir/files/durovek.pdfIn PDF document text
    • http://ags-sib.ru/ckfinder/userfiles/files/soxuxifejopejud.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16076887def09e---popizuxipez.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/27935931748.pdfIn PDF document text
    • http://theartofdesign.nl/ckfinder/userfiles/files/nolixasiposexogikugo.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/30649516214.pdfIn PDF document text
    • http://topoint.cc/userfiles/fckFile/20210707190034.pdfIn PDF document text
    • http://cokhihoaiduc.com/uploads/files/wetumovuro.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1d29e3f8f---81572252287.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=science+chapter+18+class+8+question+answerPDF 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_off0000b826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB826 11140 bytes
SHA-256: 9580d99bb056181797ad0a685c8c970af6eaa91833fb13d73c6c783683909dcb
font_01_sfnt_off0000d231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD231 15676 bytes
SHA-256: b6f85e54db5c78f676286395a1cec12129249e2e9dc339cefc0daf9da65669be
font_02_sfnt_off0000f9f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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