Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c75e6e15495aa94…

MALICIOUS

PDF

69.3 KB Created: 2021-09-26 02:09:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 48e1df4a21cfc18f010d45fa3deddf57 SHA-1: cee6b22b1608509db56f9416d6d8325c57c33f24 SHA-256: 6c75e6e15495aa9414861c0b1eb702359f553526b5350e21c5ccc605fe6fed24
156 Risk Score

Malware Insights

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

The sample was identified as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs that form a link farm, with several pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or redirection scheme. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://quesnelfoundation.ca/userfiles/file/79021081230.pdf In PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138494ce30c2---21004006212.pdfIn PDF document text
    • https://shiprapublication.com/uniformkontakt/userfiles/image/files/72886235177.pdfIn PDF document text
    • http://studiogiovannone.com/userfiles/files/sodebugimorakosu.pdfIn PDF document text
    • http://chothuethietbi.info/img/files/41902755088.pdfIn PDF document text
    • http://bestorkate.com/uploads/ckeditor/files/2253061153.pdfIn PDF document text
    • https://mehfermobilsaglik.com/userfiles/file/kowanivefuwelureke.pdfIn PDF document text
    • http://tecniagua.es/uploads/ckfinder/files/widimiziladivawasolekud.pdfIn PDF document text
    • http://hiro-seiko.com/upload/files/59161779395.pdfIn PDF document text
    • http://hataylezzeti.com/resimler/files/24907769176.pdfIn PDF document text
    • https://beyondpins.com/calisma2/files/uploads/93658916630.pdfIn PDF document text
    • https://hfbee.tw/upload/ckfinder_temp/files/20210921102718.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/rekovevufozumuxavokobedan.pdfIn PDF document text
    • https://dubaimotorcycletours.dubaimotorhomerentals.com/uploaded_images/files/2915790305.pdfIn PDF document text
    • http://cwesp.biz/upload/file/59937252296.pdfIn PDF document text
    • http://furnitura-syndicat.ru/ckeditor/ckfinder/core/connector/php/uploads/files/sepifonexol.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/latagu.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/14178327208.pdfIn PDF document text
    • https://carsen.sk/editor_uploads/system/files/furilegitupeposi.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614dc14c9a824---79902963226.pdfIn PDF document text
    • http://atlonnuri.org/UpLoadImage/editer/files/bivokirijofubosuvir.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/83192739508.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/9a3c56bc7c387ca70f3561b5928cdc73/81869043079.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161428b30a7871---71926963597.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+block+an+app+from+being+downloaded+on+androidPDF 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_off0000b08b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB08B 14952 bytes
SHA-256: 040fd60d5e7d185552b0ac39847284c210910949f481e5dbb33cf223c6a5cb71
font_01_sfnt_off0000d62b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD62B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE42 11104 bytes
SHA-256: ad8bcfea34e8ac3802cf0bcb5082ad6863516462429c3c8f56654fa8a83430cc