Malicious PDF — malware analysis report

Static analysis result for SHA-256 a88bb36449fa2113…

MALICIOUS

PDF

67.8 KB Created: 2021-09-27 15:20:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: a0342a6a78b2a3d9a943d3b55489cc74 SHA-1: a2854449a24fc788b53d861f0a84724c99e01fcb SHA-256: a88bb36449fa2113001670e1e095460ed12b6e6806ec57f354b9a01636cc4926
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicative of a link farm used for phishing or malware distribution. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification strongly support a malicious intent. The file's structure and URL patterns suggest it's designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://tavcam.com/upload/ckfinder/files/97400633220.pdf In PDF document text
    • http://backkwang.com/userData/board/file/26673316012.pdfIn PDF document text
    • http://agriturismoilnoceto.com/userfiles/files/88203323860.pdfIn PDF document text
    • https://factorysales.com/userfiles/files/46071430419.pdfIn PDF document text
    • http://champagne-marc-chauvet.com/images/files/fafifa.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/tuxisefolev.pdfIn PDF document text
    • http://avandcie-automation.com/ckfinder/userfiles/files/vepoto.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130db152c4ee---92959096109.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16150f45e2bb14---tukububelatoxomerutu.pdfIn PDF document text
    • https://warsztatgdynia.pl/app/webroot/media/files/ramen.pdfIn PDF document text
    • https://jeevadhara.org/work/london/userfiles/file/15306071743.pdfIn PDF document text
    • https://shopinhome.com/ci/userfiles/files/mefuraw.pdfIn PDF document text
    • http://autoscuolauniversale.it/userfiles/files/pujedomereriramidelege.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/15576609592.pdfIn PDF document text
    • http://vodnik48.ru/content/file/tipokitesam.pdfIn PDF document text
    • http://finalbrand.cz/upload/file/zaminevo.pdfIn PDF document text
    • http://pop-around.com/file_media/file_image/file/24957230148.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/levupuwapetuj.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16137d14a48e8f---xexij.pdfIn PDF document text
    • http://vinhhangvien.com/upload/files/gisatoxo.pdfIn PDF document text
    • https://grandiosieventinuziali.it/filesUploads/file/68432481462.pdfIn PDF document text
    • http://actybrain-consult.com/Upload/files/89341081823.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=write+on+pdf+ipadPDF 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_off0000ad48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD48 10268 bytes
SHA-256: b838015e53585d9b931cccf274b7c9641b89182d00edd9e851fdcb9e42832919
font_01_sfnt_off0000c47f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC47F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dc91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC91 14828 bytes
SHA-256: 2fdc5870b9782c59690abd1e964b44cf69ffa329ed9309bb342aba8fbf813f71