Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8836a8a85ecb151…

MALICIOUS

PDF

94.8 KB Created: 2021-07-25 22:17:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 49d67800211eadba4755fa7a5f3ef920 SHA-1: e8f7a1f6962ff8faf66124c0e65446487f8aa06b SHA-256: b8836a8a85ecb151f0f22f3a97df8b2c4c5bb1cf18e862aa92e628946fc0d98d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting domains. Heuristics indicate this is a link farm designed to redirect users, likely for phishing or to download further malicious content. ClamAV and ML classifiers also flagged this PDF as malicious, supporting the assessment of a phishing or trojan delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://suprizpin.com/calisma2/files/uploads/bigorepomegolilubijiw.pdf In PDF document text
    • http://nw-line.ru/generic/uploaded/bafofuwefafabalatafoda.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/3a98c78d2ca1a800b9fed76043541d71/xarewora.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210706204625194.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ac142856015---99569857476.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079fb75b05e1---tunegulojujozab.pdfIn PDF document text
    • http://iproperty.ae/userfiles/file/jujupeg.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/265c872cd46247c7a44938784ca59003/99125227562.pdfIn PDF document text
    • http://qca.ch/userfiles/file/45764493458.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/05963d42b891b08912d4199f0939ae8c/sewewalaxeg.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/ee1de62695ba8959982a88f0f11247d1/32886275617.pdfIn PDF document text
    • http://happy-travel089.com/CKEdit/upload/files/17900601043.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/fb1b846b5ab0324215c2643034314169/86159877955.pdfIn PDF document text
    • https://unosms.us/userfiles/file/99803899079.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/55768b3b0b02ac8c5fc79a2bbddd542a/gusevubidu.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/k1vo4b18tachrj44e4n2bn4rrg/wofuviseteroj.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/30399269930.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/ohm9588gvc27ivtfr3nius4j4h/26847872966.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8aa80653b---18756508769.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094610d82e4b---nunajivadok.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/cpgq257tgsing7ss19hopdnrvj/95972620300.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1608f697f5cbbb---56276135965.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/2an6f4b8hqeubej51v3ntg8br3/zefojodiga.pdfIn PDF document text
    • http://trans-serwis.com/userfiles/file/gevofugakolevo.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080a52fb19f9---subosadetojedaxuruvigisap.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/sotaragonisupimopajobuwun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+get+free+money+on+cash+app+without+human+verification+or+surveysPDF 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_off00010ba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000123b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B8 11236 bytes
SHA-256: 6830fd05e4d78200efed8f13715766d0291bd1067eab59428c07bd34fb680111
font_02_sfnt_off00013df7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DF7 17708 bytes
SHA-256: 30595cc06aa21c6564fafb75b70c358d0984165fe981364f420fb6a425831693