Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d5696da12b724a3…

MALICIOUS

PDF

86.3 KB Created: 2021-09-01 07:18:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 958fb319001e5059a3d7255e4531b5c1 SHA-1: b53b2b3484d363e6c7c3c4ce00980ea4d88f5f5a SHA-256: 9d5696da12b724a31c14bc26f452b10accb51e3f0022b22f08d136e08a69d3e6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised websites, many of which are hosted on disposable domains or compromised WordPress installations, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a tactic to obscure malicious links. While no scripts were explicitly extracted, the presence of external URI links and the ML classifier's high confidence score point towards malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://aydin-elektrik.com/resimler/files/72324434064.pdf In PDF document text
    • https://shidoremicrosys.com/media/powixabamurizuzuxitil.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/98478894610.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/79831587642.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ee27a29dc4f---korujodakipibus.pdfIn PDF document text
    • https://gad-elhak.com/userfiles/file/lumirozugezugogifozaj.pdfIn PDF document text
    • http://dongphuctqueen.com/upload/files/98830298966.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/39livvqfi337urmjsb8b17dei2/tutitefitix.pdfIn PDF document text
    • http://heatherjansch.com/ckfinder/userfiles/files/tazowipokutasigolaxiga.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/057e5c6392e3bee8cd0c46e6e4dc8cbc/52230178847.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/bibiwizudakuvuworasa.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/64826918891.pdfIn PDF document text
    • http://dfwarbitrator.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/binoxamedumi.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160791d8463365---mubiraturiropa.pdfIn PDF document text
    • http://vinacafe-dalat.com/Images_upload/files/56728628051.pdfIn PDF document text
    • https://falconshipping-uae.com/userfiles/files/70308319305.pdfIn PDF document text
    • http://dvif.fr/userfiles/file/32881160927.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607978d7015b4---fadulopasujibikuza.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092c48dcfb4a---74724964826.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/55eccc5356924c832800389e7a723229/jimesabatasimew.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/26f4b5042ded083dc4da5327f7d1afe3/pisetokusadedejobut.pdfIn PDF document text
    • http://divodizain.ru/ckfinder/userfiles/files/87592827184.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/28584170907.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=download+books+for+free+websitesPDF 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_off0000eb73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10385 18152 bytes
SHA-256: 97d06d74825b285ff787d1c9958f781645415e5b06c69ec7fb9c7653e7d5c8ac
font_02_sfnt_off000132e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132E7 10664 bytes
SHA-256: 280df09a06e4eb82340872ec33418db6a44f2c96dcf5150af1e85308c90a023c