Malicious PDF — malware analysis report

Static analysis result for SHA-256 6aaffa0a5832f82d…

MALICIOUS

PDF

73.4 KB Created: 2021-09-06 00:37:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ca845b8f974ddf9e0d6fed227c15bc2c SHA-1: af088ba865cf7f641504a234ddd653861d94cc70 SHA-256: 6aaffa0a5832f82d81e0e64da2569becc2ef18041381c8d6704f4fdcffb2a749
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for distributing further malware or conducting phishing attacks. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware delivery scheme.

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://inwebjor.ru/uplcv?utm_term=orthogonal+polynomials+of+several+variables+pdf PDF link annotation
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b854311ab1---12862424885.pdfIn PDF document text
    • http://gamebonda.com/ckupload/files/movemavokusataja.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/3b77ee4eb95a3da4e8677bc7be80278b/95480579411.pdfIn PDF document text
    • https://carlojans.com/cms/file/jinajexedidosapuweba.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ab601b71593---zunopajadasafeledeb.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/ip6egtbk8be7993ttjso732slo/84730617668.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/52776989472.pdfIn PDF document text
    • https://www.bnbtravels.com/ckfinder/userfiles/files/90554548304.pdfIn PDF document text
    • http://hungbuloon.com/media/ftp/file/movitatotewaxovelusu.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/65bf92961084f9a121b448e72967e941/78747949814.pdfIn PDF document text
    • http://nakakinpump.kr/fckeditor/upload/file/56001705989.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/josodupekurebazus.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/e052e25e2f706096f7bb6791ede8f698/wefureberukizomeditububak.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160aac8165e3a7---laxorususepesi.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/daeece26eef77165135663da29be4144/13697852769.pdfIn PDF document text
    • http://zuche0551.com/upload/file/50844019339.pdfIn PDF document text
    • http://oodow.cn/upload/file/210905175345759060asob1rl4asgb.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/11160429981.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b216cfe53b1---78097671899.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16075d695652ef---29199204561.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/jijufutegojogiviterim.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/iit5bq23h8h2016qkjp3mhfhk7/fotesifizu.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/bexozukoworenud.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c774e52bb53---dutimawidurirulekax.pdfIn PDF document text
    • http://originalbau.hu/imagesfiles/9815219446.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_off0000b967.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB967 16956 bytes
SHA-256: 19086b04a3855415f4d2ddc3fb2004c3edf07bd8526d50c81d49d5f3c64139ad
font_01_sfnt_off0000e57b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE57B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD92 11288 bytes
SHA-256: fcdc338761d9dcb5c5f2c78841ae93e2d666ebdf107000b09ddac82ceda9ee9a

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