Malicious PDF — malware analysis report

Static analysis result for SHA-256 11fca1b20553b7ea…

MALICIOUS

PDF

98.4 KB Created: 2021-09-08 06:27:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d4ab7427d43204f9124e1c5e0c82a7e2 SHA-1: f988831ecfb67558e915bf0155c2b03d570e7838 SHA-256: 11fca1b20553b7ea4415fe3fab004e93e83db6033fe3c09c6ff0f231f786c433
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the nature of the links and the heuristic firings point towards a malicious link farm designed to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://huntic.ru/uplcv?utm_term=cellularline+petit+manual PDF link annotation
    • http://manleyboone.com/clients/3/3d/3dd19be848c73b0ce3a0430f7fd535f3/File/gedometukoduluzo.pdfIn PDF document text
    • http://chinahongji.com/d/files/56536322377.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/4d77023cddcae9e3be9e4eb325a9a581/jifurulanevejaw.pdfIn PDF document text
    • https://kebecelectrique.com/upload/editor/file/jezaf.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/4dc36d2de8e408c9338c261ee8171967/70910864229.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16092bf36836e9---71926922910.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/16107b2ea111d0---kotavi.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/89480018895.pdfIn PDF document text
    • http://palenice.net/obrazky_clanky/file/30406494107.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/g36vmf2403qmbr3jdokq7re4n6/48321642158.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16104894eee04d---55976440048.pdfIn PDF document text
    • https://vinacomvietnam.vn/uploads/news_file/walemudizofuvibepilosu.pdfIn PDF document text
    • https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/pdued33u6r1p83bljgp8oltb84/53640188246.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/mvldlj3gtc4jv402gkar65amra/71749537824.pdfIn PDF document text
    • http://bscartridge.com/pic/nedirokuzituvo.pdfIn PDF document text
    • http://wmc21.com/ckupload/files/telazadagusidutonozaxetuv.pdfIn PDF document text
    • https://rendiamovisibiliglinvisibili.org/file/92190818872.pdfIn PDF document text
    • https://susta.vn/userfiles/file/rakijifaxol.pdfIn PDF document text
    • http://extrastyle.ee/ckfinder/userfiles/files/51347963164.pdfIn PDF document text
    • http://secohthailand.com/file_media/file_image/file/75864855574.pdfIn PDF document text
    • https://menuiserie-sainte-anne.fr/userfiles/file/kelopora.pdfIn PDF document text
    • http://thaimassageboy.com/ckfinder/userfiles/files/nabolobivukofarozizajukes.pdfIn PDF document text
    • http://kidneytracker.com/ckfinder/userfiles/files/jorivoxopamijufekoli.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/48759197376.pdfIn PDF document text
    • 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_off0001225e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1225E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013a70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A70 16428 bytes
SHA-256: c193b73ce8bfb4779479b2b430d4c4897c06ca865286289da60ff41c492deb0e
font_02_sfnt_off000164ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164ED 10256 bytes
SHA-256: 7cbc9b9fd76eaa408bdff45659c7aa78aa89dafe7662386ad99f365fcf124210