Malicious PDF — malware analysis report

Static analysis result for SHA-256 c27ec0dcb575bd93…

MALICIOUS

PDF

87.3 KB Created: 2021-09-13 09:24:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: c9efe17caa000c2e0acfb5be0eb7c59e SHA-1: 2564eeca0808bb72741277f3e5dace7a3ebe7e9d SHA-256: c27ec0dcb575bd936fc6a1a3a416b64a90e14915890761e8c57e20e85e3a722b
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. The presence of multiple external URIs and link farm heuristics confirms the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://talaa-obour.com/webmisr/uploadwebmisr/file/rilazuvox.pdf In PDF document text
    • https://iqmuseum.mn/uploads/files/81240176617.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/sqdpn41em3o4lgd4pg9og1pbp0/lelitozoma.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/jilumi.pdfIn PDF document text
    • https://lucky-erotic-massage-bucharest.ro/ckfinder/userfiles/files/91988979257.pdfIn PDF document text
    • https://www.ewdel.cz/ckfinder/userfiles/files/baluduvosabatudukegad.pdfIn PDF document text
    • http://hangtatmj.com/userfiles/nefonodunimavipiguxo.pdfIn PDF document text
    • http://tygodnikzuzlowy.pl/ckfinder/userfiles/files/39283658789.pdfIn PDF document text
    • http://mebel-moscow.com/content/xuploadimages/file/noxadeb.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/161352165d22a0---39399924930.pdfIn PDF document text
    • https://www.whoamiandwhyamihere.com/ckfinder/userfiles/files/madadepaxajolotiropewin.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/2533aef2810b97c1e5382ce347aa54c0/wotogesudimu.pdfIn PDF document text
    • https://ojazzdance.fr/userfiles/file/48738701608.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8755aa028---83716533746.pdfIn PDF document text
    • http://studioingegneramato.com/userfiles/files/zibujizuziwazuzixulivokog.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/perizeluv.pdfIn PDF document text
    • https://xn--90aoja6ahg5ds.xn--p1ai/uploads/files/vojuzinuvet.pdfIn PDF document text
    • http://hanyangsteel.com/files/fckeditor/file/700143974612f3c5e38dac.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161335d9147b56---22835508119.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/161372e3e427e7---vajutimuv.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/60827204588.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/09/11/file/20210911_160039_162.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=best+tank+games+for+androidPDF 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_off0000f3e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E9 10796 bytes
SHA-256: 5d08e77763cc90f48d449c6c2bb40574959e8d10d2a47acbe63d4fdf3dab43bd
font_01_sfnt_off00010ca0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA0 16788 bytes
SHA-256: dca33f623fb7cc5b099bccdc9efafdcd08ff835c0edfa4412c986dd1e2f7dff4
font_02_sfnt_off0001382e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1382E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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