Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b460f748760487a…

MALICIOUS

PDF

81.8 KB Created: 2021-09-04 05:44:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4b9a2a78aed85bc0bc6b4a0a9da5a411 SHA-1: 8e553aa35d3b68484be801a5cd5bfeb34a9cd3e0 SHA-256: 5b460f748760487ad53dc29a5a0d6252f094d369a90434e1a5b989ef40b7f23f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a malicious PDF detected by ClamAV and ML classifiers, containing numerous links to potentially compromised websites. The PDF's structure and embedded URLs suggest it is designed to redirect users to phishing or malware distribution sites, likely as part of a spearphishing campaign. No scripts were extracted, but the presence of external links indicates a redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://wastran.ru/uplcv?utm_term=salesforce+tableau+acquisition+pdf
    • http://pujcovnanaradi-tvarozna.cz/userfiles/files/70802640351.pdf
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/d5df52b370871845cf582bab4d6836c5/gigaf.pdf
    • https://www.stock2morrow.com/ckfinder/userfiles/files/febuvibinumopukuxazisali.pdf
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c15959e191a---kuwarexonodedigener.pdf
    • http://dancephoto.ru/userfiles/files/degiduratanomar.pdf
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/cgq6cjs9ucabm5qrbli521ivf7/mejofeduvobiniseteli.pdf
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/51b82a97ef5c4ef2b26bf448c285f462/290256522.pdf
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075eed9b5364---kukepawavukival.pdf
    • https://semineebrasov.ro/printuri-fi/files/zokolekafugodasifojaveru.pdf
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160808f9c55f11---40093022051.pdf
    • http://www.ks-zahnarztpraxis.de/upload/files/tisekowafofitogameguzab.pdf
    • https://autosaloncenter.com/uploads/files/jepomozijak.pdf
    • http://zoltysnieg.pl/pliki_wyswig/files/3430677442.pdf
    • http://klick-tipp.at/ckfinder/userfiles/publics/files/lebifumo.pdf
    • http://hankyunget.net/userData/board/file/mipelolufutixipixima.pdf
    • https://alakharia.com/public_html/userfiles/file/xubapatiwusap.pdf
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/6t9ac6kb89qe7te52cittnuruu/6605853858.pdf
    • http://scbczy.cn/up_files/file/20210615_045639.pdf
    • https://sts-cct.com/app/webroot/userfiles/files/fafunusosevavudan.pdf
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/oiq3n17r47t99b89r3399lqrqk/87471563560.pdf
    • https://samarpanbharat.org/trila/userfiles/file/sobojaperoxab.pdf
    • http://sdsenlex.com/upload/files/zidobikosudimaxitosirakiv.pdf
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080c0b1ee5e6---rurutujupubatala.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8ab.bin
1a46049d11dc0e602dcd2271ff2daac669333e8b82a81552df7e859b1e2e7a00
pdf-font-stream PDF embedded font (sfnt) at offset 0xD8AB 18428 bytes
font_01_sfnt_off00010826.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10826 16792 bytes
font_02_sfnt_off0001203d.bin
2300ef1fbb199e3cb63cb68e3c0878d733571328ebd46d4da60a81c180c3179b
pdf-font-stream PDF embedded font (sfnt) at offset 0x1203D 11072 bytes