Malicious PDF — malware analysis report

Static analysis result for SHA-256 debcf86f6151364b…

MALICIOUS

PDF

69.8 KB Created: 2021-09-03 19:48:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 975c3ee2a9a0100e27091c0da3a0b6c5 SHA-1: 5816b23b1f00bb23c7e905e3a1edcef8713f3808 SHA-256: debcf86f6151364b68f7c3f2b80a712a6fdd6068230bbaf9003d180bc6f895ce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farm heuristics, indicating its primary purpose is to redirect users to external sites. Several of these URLs point to compromised WordPress installations or disposable hosting, suggesting a malicious intent to distribute further payloads or conduct phishing. The ML classifier and ClamAV detection strongly support a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://pixomot.ru/uplcv?utm_term=writing+worksheet+for+middle+school PDF link annotation
    • http://shsclassof1970.org/clients/872719/File/lumiwinadev.pdfIn PDF document text
    • https://brincandoeaprendendo.com/fotosempresa/files/26149954360.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/3440994001.pdfIn PDF document text
    • https://jsptti.com/ckeditor/ckfinder/userfiles/files/wedixegupiruwo.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16079cb6c334cf---luwabomumimalozev.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/0426m0bk4rcv4qq0qnh01bdqjo/4988848611.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/61166795971.pdfIn PDF document text
    • http://xn--80aer5aza.xn----htbdepbihnfb8cyg.xn--p1ai/ckfinder/userfiles/files/lewiwudotamidob.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/u6ibl7of3296o361bd0s8n8j27/kufofojugetarone.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/lodasobaredusopegisikolu.pdfIn PDF document text
    • http://www.abcklima.hu//data/editorfile/fasafirusevewavago.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da400384177---6164939944.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/xurufekekafulono.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/65637938919.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a26cd59d426---kijisefiwilemerogexawo.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/1bfa73d57ac5a73d5a13a742a9fc0342/papokadapikozurop.pdfIn PDF document text
    • https://fundacionamigosdelmarcaribe.ong/ckfinder/userfiles/files/89013183324.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/dukozumamiviridid.pdfIn PDF document text
    • https://thekolkatapackersmovers.com/ckfinder/userfiles/files/26414906135.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/1gqne4hfm5cnu2h9o90fukkn9f/99738191801.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb03b731e4---balotowivoku.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/941034f07e67076a246514cc1392150e/fesatanutunapulu.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/6ej03sk2q9mjeaqoqmoi3lerg4/jiradetulom.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_off0000b425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB425 14756 bytes
SHA-256: dbacd4d52603a7e6eec5def84a69465ba5d2d129a6854a84f7e8a76b2616e728
font_01_sfnt_off0000d912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD912 10932 bytes
SHA-256: a113465662cdc409c71533e9e021bb600203754033c2c807d301929c0031cebb
font_02_sfnt_off0000f207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF207 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1