Malicious PDF — malware analysis report

Static analysis result for SHA-256 03166d6ddd5ad659…

MALICIOUS

PDF

87.5 KB Created: 2021-07-04 06:48:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b12a7f6a12c076fd490cfb63f2f6e8f2 SHA-1: ec789e195809e8b1a5ab41941fcbe03fe801f4c3 SHA-256: 03166d6ddd5ad6596652761b2110df8016c765aade1b23a6d326a2c9190f9fea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms. These links appear to be part of a link farm designed to redirect users to further malicious content, likely other PDFs. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e6b310bad---vabodasozasekol.pdf
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/2b6a49849e9c8dd287449070e9181ac6/xedagenosixebupizumetisi.pdf
    • http://au-zlato.sk/upload/files/mejezexotimagosixonupeva.pdf
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607591a9a08a5---nesapojobifosaxuf.pdf
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/36254027882.pdf
    • http://lamekatus.ee/uploads/ckeditor/files/winirikedejubofekagas.pdf
    • http://files.ibiza-ferien.de/file/tabokoragavin.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b704c98ce0---maweberemasubanowapo.pdf
    • http://apvn.info/userfiles/file/denoxumekusepazomulora.pdf
    • http://afghansolar.com/userfiles/file/komepobufu.pdf
    • http://boxerdapolenta.com/cmsimple/images/file/14672295691.pdf
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/6df076d5b5d1a98134fe31dfb0b730e6/gutesapaxorojedokaj.pdf
    • https://okud-istra.hr/userfiles/file/loxima.pdf
    • https://flexrocksrollovers.com/wp-content/plugins/super-forms/uploads/php/files/kmde8bsp44974flqkpgrt2ndo7/82181795131.pdf
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160737463d9fa6---1911103375.pdf
    • https://art-eria.pl/mandarynka/pliki/files/14286662183.pdf
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed54590762---92105932885.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c32899a23ac---jozerawap.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608f994198f9c---dadupedimofikuw.pdf
    • http://ypcalumni.com/clients/2/24/24042806289e0d450134266962f0a0d8/File/xonajuratex.pdf
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/36b8781ec7a7a56933bf6f0b8b1901a5/suwawibewajebiropo.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb0a3732b6---dukudalodojigamipesolor.pdf
    • http://riversedgefm.com/files/file/gemaxasaduwexotibimu.pdf
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/3caur8q01n1eimidj0mei1ohos/89706976365.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=hair+nails+and+the+outer+layer+of+the+skin+are+made+mostly+of+a+tough+waterproof+protein+called
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efed.bin
f90538aaf9874e288fed31c42c335b2eec52be0bff067828dc7caf8badeb95d4
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFED 11448 bytes
font_01_sfnt_off00010a9d.bin
c0423d8045221f1b36fdd63affc134ded550684047ef6919aedcb398b8f09ec8
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A9D 17140 bytes
font_02_sfnt_off00013769.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13769 16792 bytes