Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cc6f8f62e35f8fb…

MALICIOUS

PDF

87.0 KB Created: 2021-07-02 03:17:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 64bf2c0d0959f11f3191bff6430d3b45 SHA-1: ac3c928dcf208fff0e4150927f8366179bcf8c60 SHA-256: 9cc6f8f62e35f8fb1f75e8d74ba2cc7442aaa649ba6c1bdfb82b31a15348b536
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to various websites, many of which appear to be compromised CMS uploads. The presence of these links suggests an attempt to redirect users to malicious sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://oniceh.ru/uplcv?utm_term=kirchhoff%27s+current+law+pdf
    • https://suksesunited.com/contents//files/luzebom.pdf
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/55ac5f08bc9ae7b71f88130f122f56f9/jazutijuramevusozab.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb2389c600---lavejop.pdf
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/db4a8f5263521d8512acb2a4d154dcdc/60033986745.pdf
    • http://tokyoracing.hu/userfiles/file/17928669686.pdf
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/s8hett3bala7e62b6s98164b7m/vudejokuvemuwuperofose.pdf
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/4fuicfcb88lt1lmup6527hduu5/suguxukesasiwirib.pdf
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/9nm3cmq8e8b7bbckvf1t4l85f5/94321971255.pdf
    • https://bawwabatrizq.com/userfiles/file/sesukem.pdf
    • http://zuche0551.com/upload/file/72394717228.pdf
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/b78140cb7aea176317e46201eb4b3671/79605056509.pdf
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/loa43lu8fcdem2bs326641v20b/45945899637.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16071751b9df23---pimekup.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160780693ba214---nasazenawimadepu.pdf
    • https://pmms-online.com/assets/file/dabotow.pdf
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/fa7f933421f7e766c3ee621d0ed9829e/viduporiritolavafiga.pdf
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16085bb11963da---zusebugutom.pdf
    • http://liebherr-tr.com/userfiles/file/ratorigika.pdf
    • http://ccsl.asia/files/90477077083.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609f69f18ab0a---8037695650.pdf
    • http://www.ferm-matic.fr/upload/file/fomezoraga.pdf
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/03897ea3ec31c149286ae140e606e571/44626370174.pdf
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc106ddd95---likiv.pdf
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/9arsbdkf9omj7o2qtu6a91oc97/tewotibazovobax.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b49c6263698---66069949782.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_off0000ef6d.bin
138644d133e0d891024a1ddc3246024325314205f6272c24d4c41baa556b0898
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6D 17420 bytes
font_01_sfnt_off00011d11.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D11 16792 bytes
font_02_sfnt_off00013528.bin
3b874ec847a18f285a0a8051ef73688b976b2a6c4631f6375bbbb389ae3aa44b
pdf-font-stream PDF embedded font (sfnt) at offset 0x13528 10928 bytes