Malicious PDF — malware analysis report

Static analysis result for SHA-256 11f34bf4081a2a9b…

MALICIOUS

PDF

78.0 KB Created: 2021-09-09 12:33:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b1481739986c2e091a1bbd64b0bcd1c7 SHA-1: 4ef4f28f1306a61fd88c59ae1c8b1931337f9de0 SHA-256: 11f34bf4081a2a9bf0727c1fdb0a636c2ac572d7d26dff10330856d393ffe410
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. The presence of numerous unknown URLs suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://arniestribu.com/campannas/file/82461976257.pdf In PDF document text
    • https://fleseriuassociates.ro/files/file/63602628054.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/zegoriredarot.pdfIn PDF document text
    • http://anthonyjcincottalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bupape.pdfIn PDF document text
    • http://pereplanirovkaoblast.ru/pict/file/71668003224.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/161335832a79eb---17948300882.pdfIn PDF document text
    • https://nabijdefossa.nl/upload/files/zevezususinepi.pdfIn PDF document text
    • http://hidramaco.com/files/files/zerejubenejiwedizoweruta.pdfIn PDF document text
    • http://itfkarnataka.com/cvsprojects/SSK/Source/2.0.0/images/files/lowatesadetanewiwutonidol.pdfIn PDF document text
    • http://crisismobile.com/ckfinder/userfiles/files/worepe.pdfIn PDF document text
    • http://ulv-fogger.es/d/files/59631731986.pdfIn PDF document text
    • http://willowslakerhea.org/userimages/26443884970.pdfIn PDF document text
    • https://buka.ru/sadm_files/4374978775.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/sr2o38td0kr9mpc6bs4gd2hrii/wagoruxaxutazem.pdfIn PDF document text
    • http://gensugroup.com/upload/files/datepago.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/35034980875.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161335ab280a8d---daberesilodalibegoraret.pdfIn PDF document text
    • http://peknanevesta.sk/media/file/mutafudoxepepuluforol.pdfIn PDF document text
    • http://cosonhuath.com/hinhanh_fckeditor/file/jiwerofofinefadukovazo.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/1615772593.pdfIn PDF document text
    • http://newcityhk.com/userfiles/vidomasateka.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/degojeleruzix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=wario+land+3+gbc+romPDF 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_off0000caf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE307 10620 bytes
SHA-256: 0e73847c80b4e219fe8256b45df8c3c910f4a5659851fd0821cd6f8d6218ae6f
font_02_sfnt_off0000fafd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFD 18084 bytes
SHA-256: ed1c0bad3d1e86a2f39a48f19b80d66b06ae5e823ba43914c827d2f385425bc9