Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebc6c2fdf5dac1ff…

MALICIOUS

PDF

76.8 KB Created: 2021-08-06 21:01:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e7935b1b62086f97c4307ef06ff23a25 SHA-1: a719a2d6a7706ffaa1d4615383cd1acb41a55239 SHA-256: ebc6c2fdf5dac1ff6ff97f006245006681ab4d033e74bf68c7fcde4a4bcd5c0b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious lure designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://crewmak.ru/uplcv?utm_term=syllabus+of+computer+science+class+9+cbse+2020-21 PDF link annotation
    • https://alshamiltrading.com/alshamilfiles/file/vurutaz.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c1204a1de---welikelasulimedekawajab.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085628217f11---bifufofuber.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/79282816393.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/30962697401.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/264baa00f4b335a735c16d38691df410/65596119371.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac32b0e1795---favunofije.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/tigisudoduxuxo.pdfIn PDF document text
    • https://roc.mn/uploads/files/jatejibibuvitobal.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/54db7cfee68fb76fe6431ef0ef2f6dd5/wupakabe.pdfIn PDF document text
    • https://local-atlas.ru/userfiles/files/tazow.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/04729ec7da395a95ea92ccbbc62abcb0/lusedoz.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/7uul722qh0bivqt08h2600pqr3/wibukasi.pdfIn PDF document text
    • https://zahnersatz.pl/userfiles/files/55076553684.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/74jlu044o3a7ier2nv7iaom6rl/56506240102.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.org/upload/files/20683512633.pdfIn PDF document text
    • https://xn--interpeas-r6a.es/upload/files/jorixafukogorumod.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/37033093147.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16071ad5e58cf8---41477645386.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/buzekelononos.pdfIn PDF document text
    • http://krzeptowski.pl/file/senis.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/vepizegoda.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609adc793bd02---kopatalupemokimif.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/hiemd0lsm7fdpbt9p4ivnl6j37/55049804471.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/2ea8d0e7620158222448f180c5e60a18/64051435208.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_off0000c794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC794 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dfab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFAB 11568 bytes
SHA-256: e2aab6c5668d8ef3f11c2f091257b71cad7f1ec1346ce551ca63cb052dc5818f
font_02_sfnt_off0000fb04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB04 16352 bytes
SHA-256: 542f79a27abb656bb42a502cc70d3f3791b732ac88ec03628fd8831df0a25750