Malicious PDF — malware analysis report

Static analysis result for SHA-256 771b64ec5035ed68…

MALICIOUS

PDF

82.5 KB Created: 2021-09-05 03:31:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4ed460679fee05b45dfae33890fca93c SHA-1: a55dc6d47ee1cc61200a82cb7f9eb25030622f91 SHA-256: 771b64ec5035ed684dccf468de987e88067152fb4c4973cdaf15577ec4d4cd48
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lure victims. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the nature of the document as a collection of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://ufnk.fr/app/webroot/files/file/79276488286.pdf In PDF document text
    • http://uteambio.com/upload/files/jumifoleten.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/sisupiludawuwutoro.pdfIn PDF document text
    • https://marosme.ro/hirek/file/wowaribopugu.pdfIn PDF document text
    • http://perfekttorun.pl/pliki/10678203334.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16098770b35097---garewaxetemujuvoz.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/wabik.pdfIn PDF document text
    • http://studioindelicato.com/userfiles/files/mazap.pdfIn PDF document text
    • https://educhina.mn/editor/files/wepijuvagofifapevuxexef.pdfIn PDF document text
    • https://homeuu.biz/upload/ckeditor/pages/files/pidele.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed28aa2c296---kokusev.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/jisowavujuxilomig.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/8cca6713800b711779453c25cee39067/76273611862.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/tinokutilu.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/ferekododurapivo.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/ec203aea0fa56e7742dc4604959936ee/238250743.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///lodetaneme.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/paninugukakeme.pdfIn PDF document text
    • https://aedwea.com/upload/foto/kibegekeb.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0753f1815---14896679086.pdfIn PDF document text
    • http://es-manzokudou.com/yamituki-n/uploads/files/44548570178.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1611d9ee755f4a---40002967237.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=customer+relationship+management+mba+notes+pdfPDF 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_off0000dc94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC94 17660 bytes
SHA-256: 833698aa27800c31e9341dce30afd8dd91454277b1c9367a3c42bf53ad8e522e
font_01_sfnt_off00010a29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012240.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12240 11216 bytes
SHA-256: b8c8921e18d6e34f7306a3ae62a9b5dec7e9240f0fde9d926e2ad62e4c7a1a82

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