Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d651660c79966ec…

MALICIOUS

PDF

80.9 KB Created: 2021-08-27 10:59:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b61a27c80afe692059e7df23b3e2c94d SHA-1: 794faae1b48556a1e7046d8d5bcc351aa3236a76 SHA-256: 1d651660c79966ec27e04b1c30c45ec9a1f5271036ea6a02a227d47b7f86251a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many pointing to compromised WordPress sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm on disposable hosting, likely to manipulate search engine results or redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=davao+museum+of+history+and+ethnography
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160885730bf4bc---60564323963.pdf
    • http://trickorsuite.com/clients/5/5d/5d84d12f6f4dfd10bbe5497c884a5f3e/File/9823842713.pdf
    • https://novzelandiya.ru/ckfinder/userfiles/files/63250409949.pdf
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076b46ce3a6e---fubivub.pdf
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ffbe8a7c2c---68321710639.pdf
    • https://rivieresoceanie.com/userfiles/file/toladuzagizusixinagubuxol.pdf
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/asuaoh69fv9koh02tq0bha8j87/wumiwulegavotidepugi.pdf
    • http://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/mivugodanokugenafabopeso.pdf
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/786a9caf392451937efd0e08d9e23d58/vozorawipesonapuzunuviles.pdf
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/5tpofatg2fqs919cmefk88i311/mezowowovaf.pdf
    • http://teplospectr.ru/images/files/wijomi.pdf
    • http://salamatekhanevadeh.ir/ckeditor/files/files/72964915719.pdf
    • https://medprobr.com.br/wp-content/plugins/super-forms/uploads/php/files/12c471042283ac63e3fb0d85103622e1/41110038822.pdf
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/d1bc6a76d0c7u9ld07imm09q72/gasekasilofuvitokijaxip.pdf
    • http://drprdesaihospital.com/uploads/77418496041.pdf
    • http://synphabase.ch/upload/file/50316131485.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/teofphfrofcro46v251b2dnlc4/96932150032.pdf
    • https://laplacedesstores.com/upload/file/wibaxajigefanuxoba.pdf
    • http://www.sec-ollivier-associes.fr/www/upload/file/dizitix.pdf
    • https://stpeterscbs.ca/ckfinder/userfiles/files/bewonezoge.pdf
    • https://prokoncept.hu/admin/blogfck/image/file/26076423126.pdf
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/98815049557.pdf
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa0677ba77---zawepulotema.pdf
    • http://movietek.vn/hinh-anh/files/bugokiwi.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_off0000d896.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD896 16792 bytes
font_01_sfnt_off0000f0a8.bin
b80769b50717fa0bd6ceaf3c7f234c668e4c202550dd348116860130ee28e971
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A8 16632 bytes
font_02_sfnt_off00011be5.bin
23fa9398de43d79fc4c0d6dac8a1bea98aa2c6c64b0689c9089830c560a41798
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE5 11180 bytes