Malicious PDF — malware analysis report

Static analysis result for SHA-256 611cef2b9619bbd3…

MALICIOUS

PDF

80.0 KB Created: 2021-09-04 02:16:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 556e223c7eb3fb8cce958db6e6d63291 SHA-1: 44c841fd4d105b129bd70290e412f636ada37277 SHA-256: 611cef2b9619bbd3d590f45ad2d2ba7eb3829c0a5d2a411bc8023e210b0d0751
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which point to compromised CMS upload directories or disposable hosting, suggesting an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the nature of the links and the heuristic firings suggest a phishing or malware distribution vector, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://walkandsmile.com/userfiles/file/dolozesonadizufow.pdf In PDF document text
    • https://purevdavaa.mn/uploads/ckfinder/files/566648633.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/44117910825.pdfIn PDF document text
    • http://laihoawedding.com/app/webroot/upload/files/3709118591.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/53900591107.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/28062d207cd8166579a8424f11228393/bovonuviguwuxabepidi.pdfIn PDF document text
    • http://prabashproperties.com/ckfinder/userfiles/files/sizexokomoxovegutapef.pdfIn PDF document text
    • https://mancomunidadvaldizarbe.com/userfiles/files/nezeke.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210622155634.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608517522e3ec---sowaburaxisow.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607410699adda---fikusabune.pdfIn PDF document text
    • http://mariancozma.com/_user/file/51803902507.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/2a3bf7a015e5ed967775dc96be3a71a7/14442608782.pdfIn PDF document text
    • http://pecsimutargygaleria.hu/files/file/bewiw.pdfIn PDF document text
    • https://bnovum.hu/downloads/98647464371.pdfIn PDF document text
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/34756959879.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/96940574722.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///bedijosapusewerinumifo.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/oikto7r7isphm9l18vqc337v8o/doditedixoduxilirisobo.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-4/20210504180054434920.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c3dd83ba0c---kunitomevimi.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/54982497381.pdfIn PDF document text
    • http://billsky.ee/files/file/27074563085.pdfIn PDF document text
    • https://agape4u.org/userfiles/file/kugebitoj.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/amdv6eh3qt2fsj2gahs715cbs4/73628293316.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=rav4+2014+repair+manualPDF 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_off0000d096.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD096 10608 bytes
SHA-256: d62d58c00f3bda9850c0820b0690a0f0915f9132e8f5039358fa08835d14413b
font_01_sfnt_off0000e8e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000100f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F6 18796 bytes
SHA-256: 4121d1bb32e8bb1907364fa9302c8a9208374cf7777cd8fa92d02b44257d9306

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