Malicious PDF — malware analysis report

Static analysis result for SHA-256 5500319f87060b84…

MALICIOUS

PDF

77.8 KB Created: 2021-09-15 13:01:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f6e28259f7d43a75e6b5eaebe27e6cbc SHA-1: 50c6d6215d25121a14d777e23782f0aaa09a33a1 SHA-256: 5500319f87060b84e20a3e7d14d469d420b7cb6a317895e0fc1d004718191e6d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to various websites, many of which appear to be compromised or disposable hosting, suggesting a link farm designed for phishing or malware distribution. The presence of a URL with 'steam+app+download+for+android' in the UTM term strongly indicates a lure to trick users into downloading malicious content or providing credentials. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://pixomot.ru/uplcv?utm_term=steam+app+download+for+android PDF link annotation
    • http://balletpanov.com/uploads/files/naxixib.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/werawewifafamubole.pdfIn PDF document text
    • http://gcoekmr.org/cukashmir/User_Files/imagefile/moraxe.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/76878985701.pdfIn PDF document text
    • https://indicaperu.com/userfiles/file/vitagolupaxufugemuperis.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1613a060151c51---fasasutiniware.pdfIn PDF document text
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/murowesibinorodezuwuwal.pdfIn PDF document text
    • http://rucodelniza.ru/userfiles/file/37960614509.pdfIn PDF document text
    • http://ugyvednok.hu/userfiles/file/36569240703.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7a063edff---36885958555.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/38069151628.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/636f05f955f2e2007f09c88026034820/naxan.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/12477274760.pdfIn PDF document text
    • http://ediljolli.com/userfiles/files/parafelagegobuli.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/73859599779.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/59822707503.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/xafimiwirurosogi.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/xidapi.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/54492570774.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210912205120.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/81016036764.pdfIn PDF document text
    • https://gesema.com/UserFiles/file/xoruvumijuledatotuxin.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/tuzit.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_off0000cae5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e2fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2FC 10652 bytes
SHA-256: a8068637f148b580e0c366c171de5eae46bc706990e3fbd36b771e59b5d021c6
font_02_sfnt_off0000fb5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5A 17972 bytes
SHA-256: 1cedcb9690b97e8260bfc20fa351cd2b6b3ae185659a8896d6e2cb1266baa911