Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c476c851e880d76…

MALICIOUS

PDF

78.1 KB Created: 2021-09-20 10:13:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0e8b19c59b4d43c7a7fcb339217beb33 SHA-1: c3dc9ea3c4be88b4cb0aaca05167276410313878 SHA-256: 2c476c851e880d76cd106494e1f651cfdf189fe7058f71313a74e1e64aed607b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by multiple heuristics, including a ML classifier and ClamAV, indicating malicious content. The 'SE_BROWSER_INSTALL_LURE' heuristic strongly suggests the document's purpose is to trick users into installing malicious software by posing as a necessary browser update or extension. Several external URLs were extracted, some pointing to compromised WordPress sites, which likely serve as download locations for further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://allytemp.ru/uplcv?utm_term=adblock+chrome+2021 PDF link annotation
    • http://neonatal-surgery.ru/userfiles/files/nefudonesakul.pdfIn PDF document text
    • https://rotitelor.com/contents/files/93438496916.pdfIn PDF document text
    • https://bbu.vn/Images_upload/files/xitubuni.pdfIn PDF document text
    • http://westernstudioservice.com/admin/userfiles/file/80149876927.pdfIn PDF document text
    • http://donleroy.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/90988170154.pdfIn PDF document text
    • http://fusen-es.info/yamituki-n/uploads/files/ralejok.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/dugafuzawu.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161408bed831eb---nuxepa.pdfIn PDF document text
    • https://lekkermooi.nl/userfiles/file/mejemobozu.pdfIn PDF document text
    • http://standartbio.com/fckfiles/file/tisusodowilinanewas.pdfIn PDF document text
    • http://poptheme.cn/uploadfile/files/20210915_235102.pdfIn PDF document text
    • http://thevalleytrader.com/files/62098989059.pdfIn PDF document text
    • http://carrasvilla.es/uploads/files/88709774755.pdfIn PDF document text
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/33961708857.pdfIn PDF document text
    • http://zssadkowice.pl/pliki/mulixaxalerufofabopezafa.pdfIn PDF document text
    • https://hojoairport.com/images/file/ganug.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/36bi94ul8d6l1nc70re4ss7gk5/39877081567.pdfIn PDF document text
    • http://dkind.net/userData/board/file/45624263894.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/161363c1929b94---peretipunowotibosozu.pdfIn PDF document text
    • https://mkserwis.pl/userfiles/file/23558023834.pdfIn PDF document text
    • http://sumtinathholidays.com/admin/uploadfiles/file/13871619296.pdfIn PDF document text
    • http://020tzs.com/baige/images/userfiles/file/xikamakezesolefirojo.pdfIn PDF document text
    • http://rivebistro.net/ckfinder/userfiles/files/xivezagibiw.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_off0000cc99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e4ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4AB 17688 bytes
SHA-256: 590b7b72e0798ce2ec06ac017662ac7740ec42cf7cc497da4ecf8f28a50fe62b
font_02_sfnt_off000112ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112FF 10520 bytes
SHA-256: f5cf39f49c2ca154ae0ba814f3cdd279c1808ecbe0e357275cb77f41da2b3628

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