Malicious PDF — malware analysis report

Static analysis result for SHA-256 3846289154451555…

MALICIOUS

PDF

84.0 KB Created: 2021-08-15 15:03:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ce52d5b88eeb72f492f991c492d23c1d SHA-1: 32a0a8c79c69a1c1dfd16718d7787f324ccc4e84 SHA-256: 384628915445155559ae4dcf86edb580b3ca7eaea503bde93f8d18b65c12bc3d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised CMS upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, but the structure and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 http://jiuxingchaoshi.com/uploads/file/072342403076.pdf
    • https://termocasasrl.com/file/sugogufasepekixosa.pdf
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/d7cb5fd3c0936eb3eb076106901738de/jusimojeze.pdf
    • https://kingdomofgodmn.org/userfiles/files/minoxegedenikabetixomikoz.pdf
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b9e12a9487b---20266475274.pdf
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/aucv78vskm9i1ur9l3qfej1r89/tasubelitub.pdf
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/e2232840e41c929eb6af4b14e83ffe21/betikapojirajipub.pdf
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/eodnm8gor7u43vvooj6tf4fmoj/99516686246.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3213bf33b5---34999873250.pdf
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6766d9ea823a8aa9a2ffebce1ecdd68d/42878760794.pdf
    • http://buchtel1967.com/clients/26382/File/natupuj.pdf
    • http://solar-makernavi.com/ckfinder/userfiles/files/fefad.pdf
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607239f916880---newatoxipubasezatu.pdf
    • http://jpind.pl/userfiles/file/zupotexo.pdf
    • http://ajisushionline.com/uploads/files/fatibevezitenikivavujopow.pdf
    • http://bycongroup.com/UserFiles/file/lukesibenakotil.pdf
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d1a6fb96414---pupolomunoserumutasese.pdf
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a58f75dcb---31864405094.pdf
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ecec8d5e242---gafesojekifo.pdf
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/5svbdtkg1o8enf3b49th6ls974/derirufeta.pdf
    • http://seamacros.com/upload/file/bereleb.pdf
    • http://dintainoodle.com/uploads/files/98543420632.pdf
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e05fcc9a4fd---22255390636.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=kumar+sanu+mp4+mp3+gana
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd80.bin
0c11a07714aa05cbef96afdaf291fb09927058e41918ee2009f9adead93959d1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCD80 16848 bytes
font_01_sfnt_off0000f9dd.bin
00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DD 16140 bytes
font_02_sfnt_off00010f59.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F59 16792 bytes
font_03_sfnt_off00012770.bin
c42fe6af3f2559033ba368324bb7b47f723e229ebb96b38f729c52304335618e
pdf-font-stream PDF embedded font (sfnt) at offset 0x12770 10448 bytes