Malicious PDF — malware analysis report

Static analysis result for SHA-256 8776b2636d749dbf…

MALICIOUS

PDF

86.4 KB Created: 2021-07-01 20:44:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9da98bc595eb43dbe451d9bb9cbae0ae SHA-1: bcda27623498f0245a7d61385e713e9b33477902 SHA-256: 8776b2636d749dbf3badc8372ec5642b3eeb985545677d75d61ce28d3854f058
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious campaign, likely using embedded JavaScript to facilitate redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ketchas.ru/uplcv?utm_term=how+to+draw+for+dummies+pdf PDF link annotation
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/9653c9a226b9049f48bf19be01c37dc3/limuxelavej.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/0f6b6d4dfc45449bd5eb27934773696c/54446508227.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/fulariwub.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b891aa892cf---97758012012.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/rowowifixewi.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0cbe238b8---52092500615.pdfIn PDF document text
    • https://seitonsolutions.com/ci/files/gaton.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/8ada849c256345ff3d300c9f3bb8cdea/keserorokagupobutuxer.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1b236c31b---vegawutevuronowofunum.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d8db5e81b---80736913190.pdfIn PDF document text
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/22146240109.pdfIn PDF document text
    • https://kopari.hu/files/file/kabakojekurofujexewufopol.pdfIn PDF document text
    • http://babamoleskine.com/files/file/40790686455.pdfIn PDF document text
    • http://ahoba85.com/clients/2/26/26d353b61ac95a99d7df5001a3d58300/File/tojomuwefibuvobaf.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/ribatodu.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/loxufupobiwotopek.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/80410322328.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/25634493270.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f90abf0f8---15174926446.pdfIn PDF document text
    • https://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/887e9adc9ba8847d9380a6f70fad23a2/315429722.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/gvubcv365o0c8t4abcvv4pbl82/63729950482.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/83051858800.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_off0000ee30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10642 17456 bytes
SHA-256: 2a52fd19f444f75046a493b9202c7322f62cc501564feeb756c9196e94401e63
font_02_sfnt_off0001342e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1342E 10688 bytes
SHA-256: 7f1eabff121a0ef07b5b85fbcd80aa86c225c0557d362c5e3c9d4dc43f4dffe2

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