Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f776694024d1abd…

MALICIOUS

PDF

81.3 KB Created: 2021-09-02 15:41:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 367245b3e30d17c935d4da772e4a70ce SHA-1: 034579a3ffbad4b84c2a92cca86eb33d5162761f SHA-256: 2f776694024d1abdd31e94376e443c65164df394e065113bd01f2d02cb68148d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous external URIs and links to compromised CMS upload storage, suggesting it is designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific intent beyond being a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://irlanc.ru/uplcv?utm_term=server+2012+r2+manually+remove+domain+controller PDF link annotation
    • http://tribo.kz/userfiles/File/27045138133.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160f2467b41ab1---rapigirebamanupikeg.pdfIn PDF document text
    • https://sharadsangam.org/UserFilesTwo/file/dumopu.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/443df3c14bbc271cbfb0c73a111cb113/zinikamifewipinika.pdfIn PDF document text
    • http://fleshlight-tw.com/userfiles/file/32506179845.pdfIn PDF document text
    • https://autopratichesas.it/file/tawiririxive.pdfIn PDF document text
    • http://oikoscoccatoarchitettura.com/userfiles/files/nudeduvuveza.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2bf07a83d---datifivudekotabitumoj.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/35817380629.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160858b1e2ce2d---47109133167.pdfIn PDF document text
    • https://www.mediawerf.nl/bundles/store24backoffice/ckfinder/userfiles/files/dapajabodudabo.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ad1839c7e49---ragubuvuxolija.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160878cae95a33---15565089497.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/920449a8311e28ace59fbbe1354252a5/gemobawagexexizidu.pdfIn PDF document text
    • https://tckontrola.hr/files/94027840943.pdfIn PDF document text
    • http://condominiobrisasdelnorte.com/userfiles/file/tovozatilukuzeg.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/10b72c156fb38f15c0c6208be9b81d78/xulejefujiforesilolasob.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/dobamujomijuzek.pdfIn PDF document text
    • http://tutek.eu/userfiles/file/7104800730.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/33364143581.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/65002794100.pdfIn PDF document text
    • https://www.mediawerf.nl/bundles/store24backoffice/ckfinder/userfiles/files/tizosikevopinefewovu.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610ab545d9c59---vizuvili.pdfIn PDF document text
    • http://archgeo-leszno.pl/uploads/userfiles/files/76989737031.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_off0000d878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD878 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f08f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08F 11012 bytes
SHA-256: 0cc451f46519a7343636ac63892a6b77cb1f191ea36f16d8c82309fc0b3bbd69
font_02_sfnt_off00010a42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A42 17448 bytes
SHA-256: c32a5c6019355f03fcf7e08e5cb4c96c8d5086b212a31275a85d24364ca1ae31

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