Malicious PDF — malware analysis report

Static analysis result for SHA-256 84f173bea7fd8095…

MALICIOUS

PDF

84.3 KB Created: 2021-09-05 10:00:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2b099195bbfa9e7b39bd97c7ef4efb67 SHA-1: ab488a1fdd61f4a7f651c2c8a9a891ea36ea6429 SHA-256: 84f173bea7fd8095a580e54979ade681b06694ffb11ae521536806cb57e449fb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting it functions as a link farm to distribute malicious content or conduct phishing. No scripts were extracted from this sample, but the presence of numerous external links indicates an attempt to redirect the user to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://pixomot.ru/uplcv?utm_term=caldera+grand+rip+user+manual
    • http://giadinhlaurenso.org/upload/files/19584796067.pdf
    • https://drproperty.in/userfiles/file/91779344859.pdf
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/6d4bbba2e898292c8250133c472bfced/73396137643.pdf
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/dm693f4u1ppk6cqloa712pj513/90940847817.pdf
    • http://d4sontario.org/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/78242630029.pdf
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/11b2679143a8757f9c1a12fd6961e27d/jusafedafawebelivorimef.pdf
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/d8727041bc0cc96a48c9ecb064f0cb9e/2437821564.pdf
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/41783181165.pdf
    • https://mariapolis.es/ckfinder/userfiles/files/bulogobob.pdf
    • http://lubrifianti-auto.ro/files/file/zotutepo.pdf
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/fdfa7e764a3e1144618c9c420f40b22f/kawofalebozu.pdf
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a10db4c3a01---bijamira.pdf
    • https://elnativocoffee.com/silver/upload/files/tasupizeravokodolomo.pdf
    • http://makaroma.fr/upload/file/xarixiwafudotemu.pdf
    • http://eds-muhendislik.net/ckfinder/userfiles/files/gigotelevalivas.pdf
    • https://fnb-concepts.com/images/uploads/files/xojides.pdf
    • http://biondiairsystem.it/userfiles/files/minogagufomijetasidebotu.pdf
    • https://securityguardsupply.org/php/uploads/file/6680494940.pdf
    • https://piataafacerilor.ro/app/webroot/files/userfiles/files/37895688537.pdf
    • https://aldurra.ly/images-editeur/img/file/xafozaxoferile.pdf
    • https://certifiedcollisionrepair.com/home/cert/public_html/ckfinder/userfiles/files/27307119957.pdf
    • http://yorkiematch.com/clients/6/65/653dc45b8f6063886304ac4260dbb99c/File/bajijefivumexexezob.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_off0000e4e6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E6 16792 bytes
font_01_sfnt_off0000fcf8.bin
8f163d7d29a52b62d4f3b47ed3e05915644b3372401a13a155d24e1005005612
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF8 17888 bytes
font_02_sfnt_off00012b99.bin
445e0f0ba214c1b11099b600db89997a079741dab308cda1d9c45960aa7bcedd
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B99 10648 bytes