Malicious PDF — malware analysis report

Static analysis result for SHA-256 d694aa961ce2c077…

MALICIOUS

PDF

81.7 KB Created: 2021-10-12 01:47:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e11d346e01df9fdcf2b550ba6ecb8ea5 SHA-1: 8687428299e893f91a7ff6b6a4c5de6499c74980 SHA-256: d694aa961ce2c0776bcca0c41d619933af74844649a857bc96bb72fb17a0b6fc
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites. The embedded URLs, such as http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16164a4a38bdc9---jinedosudoxamipijerasizu.pdf, are likely used to distribute further malicious content or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://ipcmanpower.com/admin/style/images/userfiles/file/95309170827.pdf In PDF document text
    • https://maconlux.lu/userfiles/files/zezafiwenukogezexeb.pdfIn PDF document text
    • http://fecirturizm.com/resimler/files/87729702715.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/rokigevovubamelula.pdfIn PDF document text
    • https://sporyolu.com/resimler/files/24169714366.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16164a4a38bdc9---jinedosudoxamipijerasizu.pdfIn PDF document text
    • https://btegypt.com/file/73020259379.pdfIn PDF document text
    • http://sro52.ru/uploads/files/jekid.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/48133252616.pdfIn PDF document text
    • https://dom4m.lv/userfiles/files/53811682880.pdfIn PDF document text
    • https://evermoral.hk/upload/file/1630958810.pdfIn PDF document text
    • https://rhuyscampingcar.fr/images/files/72071329297.pdfIn PDF document text
    • http://jiangsutravel.kr/userfiles/files/20210903_163507.pdfIn PDF document text
    • https://thebillionbottom.com/business_school/uploads/file/gikulin.pdfIn PDF document text
    • http://cobmedia.hu/include/31800547797.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/81726791918.pdfIn PDF document text
    • http://hglobaltour.com/FileData/ckfinder/files/20210905_7154A2335C038C02.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/e67a847e5cb3636ab8738111dde931e1/gaxuxewelusodunuxobur.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/zoxibolim.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1615f7f55d0efb---womiwedeneganizadexaruxak.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16151a10857c56---pifozewopegipedogaso.pdfIn PDF document text
    • https://bimetoor.com/basefile/bimetoorir/files/91566807923.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/61833903632.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/89512367029.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1cba537a4---71004673539.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161610651de7c6---51485698998.pdfIn PDF document text
    • http://ok-poland.com/userfiles/file/32174542973.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/UsNeCLCzgYg/uplcv?utm_term=fever+with+thrombocytopeniaPDF 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_off0000d4df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF6 10808 bytes
SHA-256: 9292019d766e370a541ee2d2555da1bfbf41f9eb8e5de08912a577fe55bfb4ec
font_02_sfnt_off00010589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10589 19692 bytes
SHA-256: 7f216d3351b0595b49f7573e30a0e76f85a7abdbd6e698f106287cb50c543237

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