Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef7debede6e1aab9…

MALICIOUS

PDF

84.2 KB Created: 2021-09-22 20:29:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1f7842f03b64c985e01584706025db5d SHA-1: e27dbe95f285597cbad25fb2c70a0cf5805070ee SHA-256: ef7debede6e1aab93a5c32086c04a265f60dc78d4be570cb0408d5b22d7c9b82
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with multiple URLs pointing to potentially compromised WordPress sites and other disposable hosting. The embedded URLs and link farm structure suggest the primary purpose is to redirect users to external malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144123558930---27534415706.pdf In PDF document text
    • https://theloneranger.tv/clients/loneranger/ckfinder/userfiles/files/fogaruzexabawawimo.pdfIn PDF document text
    • https://www.info-service.com.tw/plugin/ckeditor/ckfinder/userfiles/files/76042608244.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/87317256682.pdfIn PDF document text
    • http://alltechsro.cz/files/38005918179.pdfIn PDF document text
    • https://h1t-urlaurora1-turbo.com/contents/files/fewunixoloseluradi.pdfIn PDF document text
    • https://siliconautomation.com/userfiles/file/zelapisi.pdfIn PDF document text
    • https://glearningsolutions.com/userfiles/files/lejamukijar.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/lisutulemejiwagizos.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/ece34567543b76248010e9215d0fd569/97236821726.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/bf251f53b2dae790a17072418fc45068/49479656191.pdfIn PDF document text
    • http://pharmabiosolutions.com/filespath/files/20210919192822.pdfIn PDF document text
    • http://eikenhorstgroep.nl/userfiles/file/24004323769.pdfIn PDF document text
    • http://unstitchedfootwear.net/files/file/29949223571.pdfIn PDF document text
    • http://ministerium.pt/files/22029726774.pdfIn PDF document text
    • http://kdwatch.net/upload/files/2021091021461832.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/jezapuvizozezovox.pdfIn PDF document text
    • http://milwaukee.center/userfiles/file/texen.pdfIn PDF document text
    • http://alpinist.store/sribati/editor/uploadfiles/mifanivabi.pdfIn PDF document text
    • http://ebd.su/UFD/7623/files/66089795411.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/zazexubabefiguruli.pdfIn PDF document text
    • https://vanvoorst.info/uploaded/file/wogedepanobi.pdfIn PDF document text
    • http://maaramachandifpo.com/admin/userfiles/file/98308440571.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=how+to+open+cell+phone+without+power+buttonPDF 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_off0000e49a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE49A 17804 bytes
SHA-256: f711010242447633c47c471ac76dee766e515539fdb9896b289858bb9d32d78b
font_01_sfnt_off00011379.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11379 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B90 10460 bytes
SHA-256: f9598c2be98b83dc308ff99b49ede0597600f3af442ba1e6fdf2b040a21c17ef