Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb95665bf95681da…

MALICIOUS

PDF

81.1 KB Created: 2021-09-23 17:18:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bc00c604e6099b30dd85ce28e9cad3af SHA-1: 20ff079416bbbbe20a8f7c5c7cdf5e8efd53feb0 SHA-256: eb95665bf95681da7d2c46f7ede5988377444afbf07a48bc1b53cbe3aedefae7
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution scheme.

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://cructi.ru/uplcv?utm_term=how+do+you+sync+your+phone+to+your+laptop PDF link annotation
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/bufibezo.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/62517102160.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145c4e6e2e0a---zimomitevutibebeje.pdfIn PDF document text
    • http://www.elstar.ru/uploads/files/zuleponaxexevuwedudalete.pdfIn PDF document text
    • https://uleiuri.ro/userfiles/file/17817178565.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/19432935392.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/t7r74sj812vvuoi29f9eg4dbtj/86005201457.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/lezanolamamikevudimop.pdfIn PDF document text
    • http://hanlacsclub.com/ckupload/files/19368666404.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/mibojovokokavep.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141cfabbf11e---55024181080.pdfIn PDF document text
    • http://topspeed4wd.com/ckfinder/userfiles/files/57832323522.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/gebovebojib.pdfIn PDF document text
    • http://tiszaikaland.hu/upload/file/zelefud.pdfIn PDF document text
    • https://thehouseproduction.net/file/xibenuwuwilanab.pdfIn PDF document text
    • http://bonsite.nl/phpcmsys/file/29669094142.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/108534295.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/tisifefuravetofakifuja.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/fc488d6c42e76f42362c5df8b8c1d59f/79163121686.pdfIn PDF document text
    • https://hiperaktivite.info/userfiles/files/kinexirapaguxevodibubape.pdfIn PDF document text
    • http://salocchi.it/userfiles/files/26083824369.pdfIn PDF document text
    • https://zdravka.hlpr.hr/userfiles/file/lesujizi.pdfIn PDF document text
    • http://islaminkiel.de/webmisr/uploadwebmisr/file/pumuzuvonikasi.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_off0000d799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD799 10812 bytes
SHA-256: 9740d458c2198c0fee7a1c0a52b669b221bd3947d16853f4d7185ef047a33507
font_01_sfnt_off0000f085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF085 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010897.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10897 17788 bytes
SHA-256: 84aa16a09bf90c7dd5e6e0557c8a7d51451381f2a561177689dc06c84390f5d1

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