Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcfa7574811131a6…

MALICIOUS

PDF

81.0 KB Created: 2021-09-16 23:14:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cfcb87ee5f9771cb889559f1bbfbd41d SHA-1: f613c8a85156c3d78224caaa453e244fa296667c SHA-256: bcfa7574811131a62742fa5416dd670254fe385b90bb3eba0c060a62cfac431f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm to lure victims to malicious sites. The `utm_term` parameter in one URL indicates a potential SEO-based lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/55450596358.pdf In PDF document text
    • http://z-i-f.ru/userfiles/file/11325105248.pdfIn PDF document text
    • http://www.oteliapelsin.ru/ckfinder/userfiles/files/72349011301.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/161361fb7e614c---32459026447.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/f76e2d67a353bc690df57debbb816e36/dugarexejirov.pdfIn PDF document text
    • https://98ing.com/upload/ck/files/20210913_233427.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614390fc347c2---gumujuborujumixomebalu.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/vijemomevumofavo.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1a9748c77---27463751737.pdfIn PDF document text
    • https://eternalbliss.net/file/zikerel.pdfIn PDF document text
    • https://medbillings.us/lightspeedweb1/file/36547590255.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613c404d0e911---72885376701.pdfIn PDF document text
    • http://rentaruedas.com/files/others/korivone.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/54e40127543921e4534366f6f33d42a9/20056998171.pdfIn PDF document text
    • http://sinners-party.de/media/file/33152086797.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/tosilusufesi.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1612eec73bd9e1---taminubukewama.pdfIn PDF document text
    • https://gimenezricarte-deltabogados.com/ckfinder/userfiles/files/82154129872.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/31866662485.pdfIn PDF document text
    • http://vkts.se/userfiles/file/fuzibi.pdfIn PDF document text
    • http://plise.org/userfiles/file/mobowipidakotuwiguj.pdfIn PDF document text
    • https://laptopserwis.com/app/webroot/media/files/53036938886.pdfIn PDF document text
    • http://urgentcarepb.com/userfiles/file/vovegak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=cost+to+launch+an+app+in+play+storePDF 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_off0000d551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD551 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED63 18976 bytes
SHA-256: 5586418c966857a5d8e93bb9467c679d2ff6b5b873534255f5b6a4f94c7d8b9b
font_02_sfnt_off00011df2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF2 10716 bytes
SHA-256: ad7013ec691fde99b48fccd9569fd776d3cdba429dbba37808ca935b81011409

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