Malicious PDF — malware analysis report

Static analysis result for SHA-256 0313df00c9f88783…

MALICIOUS

PDF

84.5 KB Created: 2021-09-16 18:22:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a7f9b9e400f9fa9c744e84257032cbbf SHA-1: ad1e8ddfaa2b731969c5f0bb109812516cd8b44a SHA-256: 0313df00c9f887830237b1999f70c3e7c82fa5a41581b7ba41e3e0609980168f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that function as a link farm, directing users to various domains. Heuristics indicate these links are often hosted on compromised CMS uploads or disposable hosting, suggesting an attempt to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://garglob.ru/uplcv?utm_term=ludo+premium+gold+apk+download PDF link annotation
    • http://www.anieliasfx.com/uploads/textareas/file/wapovimijefizeb.pdfIn PDF document text
    • https://indolabtek.com/Uploads/userfiles/files/44887803037.pdfIn PDF document text
    • https://asi-filter.pl/files/file/munibekiwewebunepawop.pdfIn PDF document text
    • https://thehideawayresortpattaya.com/userfiles/files/pizin.pdfIn PDF document text
    • http://timavoshipsupply.it/userfiles/file/zidudasopojukofakefo.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/4ba159e84753b53e0c937897977d5998/mamivugabofizu.pdfIn PDF document text
    • http://mrtowing.ca/Lawyers/userfiles/file/86695116103.pdfIn PDF document text
    • http://torgoborud.org/images/file/vanodoruwilapeladul.pdfIn PDF document text
    • http://emekyesiltepe.net/images_upload/files/51704435624.pdfIn PDF document text
    • http://cmtsport.com/pliki/lefegujijudobilunitaxozal.pdfIn PDF document text
    • https://charlesstreetvideo.com/userfiles/file/22966011174.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613998f88b699---lalavenegapugajiwunori.pdfIn PDF document text
    • http://adhunikjewellers.com/ckfinder/userfiles/files/98364918243.pdfIn PDF document text
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/biguxakowogadeva.pdfIn PDF document text
    • https://jmcoverseaspvtltd.com/uploads/files/linoxalibo.pdfIn PDF document text
    • https://eurosan.pl/user_images/file/gejazu.pdfIn PDF document text
    • http://swhos.com/upload/files/47496211282.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021090615571628802.pdfIn PDF document text
    • https://brawlcall.jordanadams.com/ckfinder/userfiles/files/fokofi.pdfIn PDF document text
    • http://pataibicaj.hu/userfiles/file/20744184511.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613080b8ac308---pixewijegosi.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/35183077165.pdfIn PDF document text
    • http://adas-muko.pl/photo/file/fedonolesesixudo.pdfIn PDF document text
    • https://tpijobportal.com/ckeditor/ckfinder/userfiles/files/76258903215.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_off0000e2f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F3 10704 bytes
SHA-256: 19e7e9582ba8634dc5062dab2b0eca2b0081024d6e59da4d2542efaddf66adb8
font_01_sfnt_off0000fb3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3D 19144 bytes
SHA-256: 9a30b545e249ca3e0946700ad8e37f90ba358fc1100d96a3c617061e495a01ae
font_02_sfnt_off00012c3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1