Malicious PDF — malware analysis report

Static analysis result for SHA-256 00087702cf52eb88…

MALICIOUS

PDF

78.0 KB Created: 2021-09-12 14:38:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f9b5a19c5b849d98cca84efebc0aa213 SHA-1: 8cc3a5654baf115376835d12b9d8b12132b8c2a6 SHA-256: 00087702cf52eb8824552c88b270c2129b093157f947866079a57811b272fa15
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed to distribute malicious content. ClamAV and ML classifiers strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL analysis point to a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8db57599f---kinewuwobudeni.pdf In PDF document text
    • https://havilahbuilders.com/userfiles/file/fakaxegofekodusedi.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/9e762c9847d310349544711c02964d3e/jewejimowemekufubefo.pdfIn PDF document text
    • http://www.pantonerestauri.com/ckfinder/userfiles/files/nugezesidabeburu.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133709272033---wubejapenidituzidot.pdfIn PDF document text
    • https://hilanguage-com-tw.triangle-design.com/files/89215897326.pdfIn PDF document text
    • http://cuathepvangohaiduong.com/images/ckeditor/files/48698039294.pdfIn PDF document text
    • https://www.fyna.com.au/application/third_party/ckfinder/userfiles/files/1947266091.pdfIn PDF document text
    • http://uptownfallschurch.com/uploads/files/10172178623.pdfIn PDF document text
    • https://magicdiscoradio.com/userfiles/file/28292983795.pdfIn PDF document text
    • http://cassotech.nl/site/data/ws/files/vakasupuwaxizemil.pdfIn PDF document text
    • https://saigonservices.vn/images/uploads/files/99576022987.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/83057949484.pdfIn PDF document text
    • http://pfmconsulting.org/survey/userfiles/files/pamadij.pdfIn PDF document text
    • http://tnshoppingbag.com/upfiles/file/31808588577.pdfIn PDF document text
    • http://energosol.pl/images_cms/file/73906325444.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/dolujujadesu.pdfIn PDF document text
    • http://vdi.vn/userfiles/file/89772707142.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/24906733731.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/16134d03c8daa9---lebimebis.pdfIn PDF document text
    • http://kiemdinhcan.com/Images_upload/files/83484542132.pdfIn PDF document text
    • http://arabstina.com/ckfinder/userfiles/files/deputedat.pdfIn PDF document text
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/dikiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+print+two+pages+on+one+paperPDF 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_off0000d0ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0AE 16072 bytes
SHA-256: 519ce430539f1c99908ec0ce0c5c10542a812a17559fb6c527dbe7cdee10485e
font_01_sfnt_off0000fa42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA42 10460 bytes
SHA-256: 9d1a79228c2b65bd538db58c5fb9e8c902ec294a73d51d5539f806692e4acb31
font_02_sfnt_off0001122d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1122D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1