Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc0d6afcc1a7175f…

MALICIOUS

PDF

87.4 KB Created: 2021-09-09 04:02:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c9df4c18711209e558b3389a0f4b2ed8 SHA-1: df18779dee46533e71afda7bbe709b42402d51ea SHA-256: cc0d6afcc1a7175f18e2a43acca14cc4cddb610085bf00008fa8df9340eac796
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and link farm heuristics indicates an attempt to lead users to potentially malicious external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://archism.ru/uplcv?utm_term=android+keep+screen+off+when+charging PDF link annotation
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613864a0e6c03---fimipexumowafijufotiro.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202195184341224.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/161329d0337701---14487689298.pdfIn PDF document text
    • https://servicepapik.ro/files/berosatoxexedu.pdfIn PDF document text
    • https://allora-tour.by/var/upload/file/92454156564.pdfIn PDF document text
    • http://cokhixnktientien.com/Images_upload/files/vusiwimutolowa.pdfIn PDF document text
    • http://ave-france.com/pics/files/53040084099.pdfIn PDF document text
    • http://honyi.tw/ckfinder/userfiles/file/sumolataf.pdfIn PDF document text
    • http://3wsystems.com/shipinc/userfiles/files/95553774255.pdfIn PDF document text
    • https://cs168.tw/upfiles/editor/files/59684449362.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/m3qdv84i0u08r2c14drdte9p01/95227618543.pdfIn PDF document text
    • https://charlesstreetvideo.com/userfiles/file/54452855846.pdfIn PDF document text
    • http://hamishehbaharcarpet.com/My_Project/Hamishe_bahar/ahar_img/files/74719508075.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/digunigoliposamesukekena.pdfIn PDF document text
    • https://heureka-cz.eu/files/zufepanetajigesebibelugom.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/16434489820.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/82911717062.pdfIn PDF document text
    • http://gainliving.com/upload/editor/file/64570458883.pdfIn PDF document text
    • http://partnercable.com/files/21062820536.pdfIn PDF document text
    • http://astprom.ru/sites/default/files/file/43045246859.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/793559b401c9f7c6f0f01518a1eb4ee5/60616769718.pdfIn PDF document text
    • http://meubelenindex.nl/images/uploads/58686355125.pdfIn PDF document text
    • http://oskarmak.com/userfiles/file/42536726017.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/35863998199.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_off0000ef59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001076b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1076B 18344 bytes
SHA-256: 631067093648d43923072430f9271020d3e940dc3d03dbbdbe0eafb798d2d1a8
font_02_sfnt_off00013685.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13685 10916 bytes
SHA-256: 477a0cb4fd505fc468704c9be3a86fabdab8e27fa190c8e361bf5f75b0e4f356