Malicious PDF — malware analysis report

Static analysis result for SHA-256 41beecb696a5f4b4…

MALICIOUS

PDF

77.3 KB Created: 2021-09-21 16:25:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e10f31c6b4399089e34263f6f314a0d4 SHA-1: 6b4fe80f8619f3a41938546355c8d5f0da98bd23 SHA-256: 41beecb696a5f4b48ddffd3f34c35df1d899d4f9016b4c8f8a0b0c6c79b2b6c0
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm, with several URLs pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. No scripts were extracted, but the embedded URLs and link farm structure are sufficient indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://ldoris.com/upfile/files/20210904070802.pdf In PDF document text
    • http://skncn.com/u/files/48045243486.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133a909d0c5e---60123511923.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/68101315636.pdfIn PDF document text
    • http://mdtrend.hu/files/file/fipigabixuzawibenewapaxuj.pdfIn PDF document text
    • https://hanurichurch.org/ckfinder/userfiles/files/60450884270.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/62807019324.pdfIn PDF document text
    • https://zakarpattya-tour.com/upload/xoworemafunufuguf.pdfIn PDF document text
    • http://arisutour.com/ckupload/files/47100373887.pdfIn PDF document text
    • http://casauthienan.com/fckeditor/editor/filemanager/connectors/php/temp/file/60279684936.pdfIn PDF document text
    • https://www.igescanada.com/ckfinder/userfiles/files/13096408394.pdfIn PDF document text
    • http://stroykap.com/application/views/stroykap/userfiles/file/55548440259.pdfIn PDF document text
    • http://schokofontaene.de/idata/disofisaxuwosujevumufi.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144e32f7486a---91947812745.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/79193903690.pdfIn PDF document text
    • http://immopolignano.lu/images/fatepuvot.pdfIn PDF document text
    • http://edeins.com/userfiles/file/fidaraxe.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614920a8d49fd---xigewogebosawebinezuxosur.pdfIn PDF document text
    • http://brukbet.com/user_images/file/tozuravosotijekibuf.pdfIn PDF document text
    • http://qazaqbanki.kz/data/content/files/76735624822.pdfIn PDF document text
    • http://altinay-law.com/images/file/18126667152.pdfIn PDF document text
    • https://medbillings.us/lightspeedweb1/file/36547590255.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=cozy+house+bloxburgPDF 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_off0000c7a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7A7 10476 bytes
SHA-256: f07229e0acf6be4a6cc2a1d44e1718e9068f1ee5b793c0a223b33b937c6d4d77
font_01_sfnt_off0000dfb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB8 19108 bytes
SHA-256: b2f77d49792ae8fe28b11ba51026372a37c85a73bdcc7de9e082268bffa92ae0
font_02_sfnt_off00010ff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1