Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e3b8ce0d31dadd8…

MALICIOUS

PDF

83.6 KB Created: 2021-09-06 21:51:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: db9a243bbadd907ae214e0d9ae3d1f78 SHA-1: 77e349efdbb74a171ff54a2e8fa9644141eab611 SHA-256: 4e3b8ce0d31dadd87c74bf8f60d81c61e09bc906c38ec3e2e75cff57340fbfd8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an invoice-themed lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://smidgel.ru/uplcv?utm_term=finance+act+2019+amendments+pdf PDF link annotation
    • https://ags-car.com/upload/files/44605500477.pdfIn PDF document text
    • http://erex.hu/upload/file/99399068743.pdfIn PDF document text
    • https://peisheng.org/uploads/ckfiles/files/61305349b88d4.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d8cde655cdb---wetogaxenewipodiwajolub.pdfIn PDF document text
    • http://biaikatolikus.hu/files/file/repuxan.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/12306761756.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/9308756642.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.com/FileData/ckfinder/files/20210809_974A967A60802362.pdfIn PDF document text
    • https://31app.com/userfiles/file/19433278004.pdfIn PDF document text
    • https://flour.co.uk/ckfinder/userfiles/files/66801233619.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7256586c0---72270452824.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/1chf6o8hl8heb3tgbc2p55e5h7/xavatabodiro.pdfIn PDF document text
    • http://exteractif.fr/pictures/2/59644094048.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/83bu8514kbthf0vbmnuen832g1/luvalimixexilixexupe.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c92e8d9360f---40956725043.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e7dafb47e0---votomijogukiniropulim.pdfIn PDF document text
    • https://ruiguoex.com/upfile/files/2021/06/25/96081878848.pdfIn PDF document text
    • http://branpc.in/ckfinder/userfiles/files/41356914679.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a987e87caf9---wujowopobe.pdfIn PDF document text
    • https://doosradashak.in/ci/userfiles/files/vulojalozejipit.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc0111d129---pasivedu.pdfIn PDF document text
    • http://buyyoutubelikes.com/ci/userfiles/files/60251760552.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/5b068678da3f754fc481221f620c1d92/ridujapox.pdfIn PDF document text
    • http://saipanbooking.com/FileData/ckfinder/files/20210623_20F8FD6BDCDD729F.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607eedef69398---tenamojijovoribovapele.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160aebeafba4f1---pojupetiboxonukijup.pdfIn PDF document text
    • 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_off0000e09d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE09D 18032 bytes
SHA-256: 72093288bbffa30ec6f094a649a476191ebbf3b6a78209e313376e462e47874c
font_01_sfnt_off00010f11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F11 10956 bytes
SHA-256: 9c50ee77e87955da6e6c59c911778570011b3907505aa0b1e17cc8bcfb04edca
font_02_sfnt_off0001288d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1288D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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