Malicious PDF — malware analysis report

Static analysis result for SHA-256 73ebf76bb00a7e9f…

MALICIOUS

PDF

89.9 KB Created: 2021-07-07 22:05:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7093069b527305d3a715186400b471c8 SHA-1: 55b53914936bdb4ea3cba56282f931eab2e8cb8b SHA-256: 73ebf76bb00a7e9f9f563605228c3e08d468de0177f5055edbfa441e6db1eb1b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised CMS uploads and disposable hosting, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of 'cmd' tokens in the document text, though obfuscated, points towards potential command execution or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083d7e283fcf---97018672705.pdf In PDF document text
    • https://sgotomotiv.org/upload/files/39946014527.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/usi6jo1j6iaec5j1fuocgenfq2/ligutotaronozabo.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/fajosogotikemabiz.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/59080562505.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/fc4f404c4b6b578c60f8198968925bcc/50144060145.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/2ek047lranfa2a6a1gl3o5jeu0/95018317504.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/31193503773.pdfIn PDF document text
    • http://promador.pl/userfiles/file/12224767855.pdfIn PDF document text
    • http://evpltravel.com/xv_image/file/fusazolivomopiz.pdfIn PDF document text
    • http://edgecs.net/documents/2170613130.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/1424103161.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/8b96a3eed19aa2b96522c443fb4c7f93/66374138528.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a308640b7de---jotofosodifaxiterigutoxod.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/be639id0vtlm0v4tcfgpg6a6hb/vibitonoxekokef.pdfIn PDF document text
    • http://overtonnation.com/clients/f/f9/f97855507a39dfa58978186db9bff07a/File/2102591593.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/49819615110.pdfIn PDF document text
    • http://kleiberit.ru/files/file/10809521166.pdfIn PDF document text
    • http://viticoltura-enologia.com/file/87012020580.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/sitikazofidovafe.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/7qulcu1c42u7jt6cmd4q1flk4c/71792698544.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/xodanixiji.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/72761110656.pdfIn macro / runtime command snippet
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b35ac123fb0---40378630606.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=list+four+properties+of+basesPDF 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_off0000fcad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCAD 17640 bytes
SHA-256: 450e8586be290db89d02045cbf43ba27f5ec03d6ce5009324d55260d19c49fc9
font_01_sfnt_off00012ab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000142ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142CE 10400 bytes
SHA-256: 3d4e1e98782a07c558cfea4371bfd84000fd378b4c8357b53f5436ffa33930d8