Malicious PDF — malware analysis report

Static analysis result for SHA-256 26acf641c806c014…

MALICIOUS

PDF

77.8 KB Created: 2021-09-06 04:32:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d940305082702dc5c1f45a0d4c5809f3 SHA-1: 4d85585eceb3b9421182394f511049710996da8a SHA-256: 26acf641c806c0147d1bcc1011c8111f782dec61a7d608dbbf25332a7d7448b1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to multiple compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect the user to a malicious second-stage payload or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/hti9nv65u2kg6lfjc0ikqq3jfl/nosikatunaba.pdf In PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/20bb8656da785e4f3e14e5eb671b3978/21409611123.pdfIn PDF document text
    • http://talleresjpg.es/img/file/zepaw.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/n4oj8js7sdc4grr25ai04r9dv4/26186388049.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/30812136991.pdfIn PDF document text
    • https://global-brand.net/userfiles/files/firotir.pdfIn PDF document text
    • http://www.tecs4.com/intranet/ckfinder/userfiles/files/juratudisenu.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16072285e6d43e---72875336623.pdfIn PDF document text
    • http://cen7dias.es/userfiles/files/83319654334.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/vexanejodaxumebarulewa.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/2hv247u9b00qhd73sq2mu7vbcc/dubofenitosawilunofarifuf.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/mozamavanamirimowi.pdfIn PDF document text
    • http://placc.info/up_image/39524665745.pdfIn PDF document text
    • http://eldmsh1.ru/js/ckfinder/userfiles/files/nojajos.pdfIn PDF document text
    • http://vksraja.in/fckeditor/upload/file/73156466700.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cee791f3ef3---31770020390.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/femidawanijukifezur.pdfIn PDF document text
    • http://megalabsrl.it/userfiles/files/64337710327.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160887d2d8e15f---88974910867.pdfIn PDF document text
    • http://xycrusher.com/d/files/85112675009.pdfIn PDF document text
    • http://xn----7sbezcba9a5aggb3j.xn--p1ai/ckfinder/userfiles/files/62113220114.pdfIn PDF document text
    • http://bergepkolcsonzo.hu/userfiles/file/96123147994.pdfIn PDF document text
    • http://aybar-gallery.com/userfiles/files/dofuworaf.pdfIn PDF document text
    • https://hanedantoptan.com/upload/files/nesepaxavuxekepuworodisow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=radio+pioneer+mixtrax+manual+espa%C3%B1olPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c6ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dec4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC4 11008 bytes
SHA-256: a5927ef087051591ae98f66416f74fdc4dd960c350d3e9dabdf8e287c5dacb19
font_02_sfnt_off0000f814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF814 18300 bytes
SHA-256: 98474d85b1ae9b23d59ccbb279cced8a5908364d5124b0fe90aec1586da28e08