Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc6159dfafb295e0…

MALICIOUS

PDF

78.7 KB Created: 2021-08-12 06:53:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0d3b0fa2bc8ef56740b4b0a84be961d2 SHA-1: d61c5691c5986186c239e91ab535f5a0624762c4 SHA-256: bc6159dfafb295e03fea306a719c17ca62813d0d9adbeb04ba21142c298f8f2f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous embedded URLs, many pointing to compromised websites or link farms, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate maliciousness. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect the user to malicious content, likely leveraging techniques such as T1566.001 (Spearphishing Attachment) for delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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=4.1+angles+formed+by+intersecting+lines+worksheet+answers PDF link annotation
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d2d4bd696fc---lisopipatekunu.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/janadofupeteburule.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/gazizixodexetikujeduz.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/co21gsr3vq60gm1ttaeu76kjk2/59776726017.pdfIn PDF document text
    • http://lungshingcentre.com/userfiles/33494625077.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f8142c825---13298732786.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610ca64aed9ec---71841963105.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/bunolodi.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160ffff5dcc0f1---2318653059.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/xutifiwimutokosamuf.pdfIn PDF document text
    • https://cupanghitam.com/contents//files/netobenemenarapa.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/e47f1c11055a0a87a0b7f006cdc32432/94503192012.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/gibexekowovozi.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/0597ee150388b0dc27822a2f83731f25/popaxizarefasaluf.pdfIn PDF document text
    • https://birudongker.com/contents//files/9471768396.pdfIn PDF document text
    • https://capecoralliving.com/media/file/xozoxojilirorojem.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/ocef1rufso3cc1u9itnm76lg8r/nafikagukos.pdfIn PDF document text
    • https://shellserva.nl/docs/Image/file/tikesadopuv.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e8a39f098---25933415890.pdfIn PDF document text
    • https://jnvhardoi.org/ckfinder/userfiles/files/14812485486.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160acac34d4fbb---68240048074.pdfIn PDF document text
    • http://araonline.hu/uploads/file/bakiluvizazef.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/feda048fcda6d7b834d03fed61a4342f/97655407145.pdfIn PDF document text
    • http://davisfolk.net/clients/1/1f/1f1070e31f35868a9a13f38ee7dc887f/File/wepuzoxazunanido.pdfIn PDF document text
    • http://ssurll.com/10rwweIn 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_off0000cc0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC0F 11456 bytes
SHA-256: 9b5b894eaff53bb83df8c5c23c898af5701f05580861014cf037a3bbc45a7331
font_01_sfnt_off0000e6ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fefc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFC 17316 bytes
SHA-256: c0fb33bb5bfc15974b57c778c1b8919473fcb39a6f278446eae3e57a5e52e978

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