Malicious PDF — malware analysis report

Static analysis result for SHA-256 bee2909ae905ac76…

MALICIOUS

PDF

76.8 KB Created: 2021-09-18 07:45:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 59532d373d18699c8af6795c8a248c24 SHA-1: fe145d5f9f150ac5eadce563730bd3ac2bdf683a SHA-256: bee2909ae905ac7614666af106087aec84d492611d96efeb54f9ddb1fbe062e2
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. The embedded URLs, despite some being marked benign, contribute to the overall malicious intent of directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/polipemimurekado.pdf In PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/wuvemewotejugo.pdfIn PDF document text
    • https://full-flavors.com/img/Data/file/36681508008.pdfIn PDF document text
    • http://yasairamenbar.com/uploads/files/dojunozajufinivum.pdfIn PDF document text
    • http://mascotdd.com/file_media/file_image/file/tafuluvum.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16133d83dde13c---83219589597.pdfIn PDF document text
    • https://maintogelonline.bet/contents/files/zenomoni.pdfIn PDF document text
    • http://ortopediaszombathely.hu/editor_up/40413760046.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142b2f34572d---90900200080.pdfIn PDF document text
    • http://daiichihousing.net/uploads/news_file/rafeborifotelu.pdfIn PDF document text
    • http://esipro.lu/userfiles/file/vukufuzuji.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/69455405161.pdfIn PDF document text
    • http://ghibms.com/userfiles/files/58240654951.pdfIn PDF document text
    • https://kaskad-74.ru/images/uploads/82834639345.pdfIn PDF document text
    • http://studiofranzoni.eu/userfiles/files/46932922657.pdfIn PDF document text
    • http://xn----7sbbgprpk7biiq.xn--p1ai/admin/ckfinder/userfiles/files/59491823023.pdfIn PDF document text
    • http://compsult.net/userfiles/file/32908362801.pdfIn PDF document text
    • http://lovepetclinics.com/file_media/file_image/file/72384436913.pdfIn PDF document text
    • https://budgetparking.ca/admin/uploads/file/28040573946.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614441098fe88---83026131880.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/161378f5d39034---93365158046.pdfIn PDF document text
    • https://intersensor.ro/v2011/Files/fck_upload/file/8058775283.pdfIn PDF document text
    • http://itagqatar.com/itag/file/files/jezuxenivulep.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613175ff33114---sofanabawixatowoner.pdfIn PDF document text
    • http://vodnik48.ru/content/file/68577883550.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=minecraft+fire+protectionPDF 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_off0000c868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC868 17740 bytes
SHA-256: 082afdf10cd3c3a0ae2f08b5b292ab1476d3bea3998950eed44b135991e2777a
font_01_sfnt_off0000f6a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A9 10252 bytes
SHA-256: bce00906000f8b057e72ee8f773b5db39d10c6aa94cc98f3e5b20817426f492b
font_02_sfnt_off00010dd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1