Malicious PDF — malware analysis report

Static analysis result for SHA-256 804a95045b445728…

MALICIOUS

PDF

84.0 KB Created: 2021-09-11 23:50:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6df283d421884fd67d71465b50d8f607 SHA-1: e3ac11263167d76c9cdf246f29b4ea8263e7e5bd SHA-256: 804a95045b445728276e3f1e9e76b84d5c3a2051708ebdf6d00b3ae52b052e0b
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous embedded URLs, many of which point to potentially compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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=how+to+move+data+from+phone+storage+to+sd+card PDF link annotation
    • http://terredellamagnagrecia.com/userfiles/files/6597150695.pdfIn PDF document text
    • http://jgweld18.com/UploadFile/file/20210902222355957.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133134632064---tunuxisexipijakomexozedok.pdfIn PDF document text
    • http://sport-zavora.cz/data/file/zomedajobokuxuwonopeda.pdfIn PDF document text
    • https://www.leasing.net.in/ckfinder/userfiles/files/25359523562.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/jubiwelup.pdfIn PDF document text
    • http://salt17.com/userfiles/files/26095455765.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613038ea9a9ab---batesesuxokebejivofogali.pdfIn PDF document text
    • https://speculatio.in/ci/userfiles/files/23532376398.pdfIn PDF document text
    • http://888spirits.com/userfiles/file/lekometiripora.pdfIn PDF document text
    • http://dorinhawear.com/admin/fckeditor/editor/filemanager/connectors/php/fckeditor/editor/filemanager/connectors/php/userfiles/file/98992399896.pdfIn PDF document text
    • https://ontogepszerviz.hu/editor_up/15533751145.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/mupovinixaxegunogawu.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/zelodosafupukatowosatirev.pdfIn PDF document text
    • https://bushregenerators.com/userfiles/files/31751006874.pdfIn PDF document text
    • https://la-klamm.org/Files/files/dutoratazimodijaguwod.pdfIn PDF document text
    • https://christianbelieversmatrimony.com/web/christiansbelieversmatrimony/photos/ckeditor/files/girijakoguludutimigarido.pdfIn PDF document text
    • http://ryyw.com/upload/files/2021/09/202109080757007637.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/40029970213.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/b6321ccdd962d680d6c61021ef92d5fc/pabaru.pdfIn PDF document text
    • http://140.121.180.103/ckfinder/userfiles/files/62316028550.pdfPDF link annotation
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/qt5m85cnfpn0urnk6pu1mot4s1/84073986372.pdfIn PDF document text
    • http://gtlitalia.com/userfiles/files/pesulakadutupinodugi.pdfIn PDF document text
    • http://manpukuorder.com/uploads/files/17096776908.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/65763430973.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/vuzufekuju.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_off0000e382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE382 11072 bytes
SHA-256: d08a8fdd1e92bfe872ef4d711c877a4b11b7bcab5684ff7c122511367cc953b1
font_01_sfnt_off0000fcf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11508 17140 bytes
SHA-256: 64eaadfe216d7dbd9711dc5f60039510f343f45942308de62141096e0a320cf2

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