Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b6fbfc808bfaff2…

MALICIOUS

PDF

93.7 KB Created: 2021-07-07 02:21:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 871cf1e88df27231926938e42997d397 SHA-1: d3737ce4d319b3cd5786eeb8e35ab3af680c5a90 SHA-256: 2b6fbfc808bfaff2ae9f67342f34870a750b6fbd5f0dcdb91f336a93ef900fbf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the presence of multiple suspicious URLs is a high-priority indicator.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://savitravel.ro/ckfinder/userfiles/files/rumideze.pdf
    • https://naucharts.com/ckfinder/userfiles/files/24347430381.pdf
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/2b055c63a30bc14f00338f0f721ab576/94208663126.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bcabca9a296---xapobisusoxapit.pdf
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/r6le9rd9r50cgbfv1nrk2leeh6/38736834001.pdf
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/60cbf73e02f0c77dfd8023f206f18d68/ditibufosarixuzagirepup.pdf
    • http://hytechplus.com/userfiles/file/dikajojipamexerezusuz.pdf
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078df9b2c053---86470305299.pdf
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160711f080ac26---11849152569.pdf
    • http://herve-coiffure.ci/files/razekijafepezovaxefem.pdf
    • http://firmykominkowe.pl/Obrazki/edytor/file/68489091816.pdf
    • https://radiosmile.hu/upload/file/15228933982.pdf
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a0eb5e5e7---fowonuroduni.pdf
    • http://laser-piskovani.cz/democms/userfiles/file/73648689943.pdf
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b0b199b1633---jivonamaruneme.pdf
    • https://tangentemag.com/img/file/9585684534.pdf
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16072a03585567---46388253061.pdf
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/9d34c8c21dc65ef041365d4fae4d4347/dalojalevelavefolegutofag.pdf
    • http://cesishotel.com/res/wysiwyg/file/54231471737.pdf
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076278a2f888---kegakuvifugo.pdf
    • http://hrt-foto.hu/_user/file/50534588142.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e565b1a11---79006929996.pdf
    • http://hill-macktribe.com/clients/7/78/785e88641dcef8d5cadf71fa969cae92/File/dedovo.pdf
    • http://aiswaryamatrimonials.com/fck_uploads/file/zavob.pdf
    • https://prosperitas.be/data/assets/file/52397496514.pdf
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/2953e45bee7e5db537fea2fe3063b498/xaxowudi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=clash+of+clans+pro+tips
    • 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_off000109af.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x109AF 16792 bytes
font_01_sfnt_off000121c1.bin
1479b90b39f7bfeb482ce7cb392c31865681004220c3b829b66a78579c087729
pdf-font-stream PDF embedded font (sfnt) at offset 0x121C1 17860 bytes
font_02_sfnt_off00015090.bin
9dc34d16f129043a8d110bad4a2de66f613ed7cf4ca59e2a7a5a1c91ff5f084d
pdf-font-stream PDF embedded font (sfnt) at offset 0x15090 10476 bytes