Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d7da9da611e6f50…

MALICIOUS

PDF

81.4 KB Created: 2021-09-24 06:26:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2beb4218f63eba795280e6e0d182e9f8 SHA-1: d9f255b08a39cf687c8fc7c9cb53b31bcd6c39e4 SHA-256: 5d7da9da611e6f501f35e003b7fea2d84b338435aa842c8febe7b3c11d61988b
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs pointing to compromised websites, indicative of a phishing or malware distribution scheme. Heuristics indicate a link farm on disposable hosting and compromised CMS uploads, suggesting an attempt to obscure the true malicious destination. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://cructi.ru/uplcv?utm_term=hari+poter+i+polukrvni+princ+pdf PDF link annotation
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/a41ad3c70e98e3effc670882a08749e9/ramasodomutigu.pdfIn PDF document text
    • https://aldapa.eus/files/galeria/files/5954367370.pdfIn PDF document text
    • http://pfmconsulting.org/survey/userfiles/files/fudodadimuxage.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/kimiserofesotoruvanu.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/23c83edb19f81ec524c3567df87b1040/46235421442.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/matixe.pdfIn PDF document text
    • https://www.alitec.es/js/ckfinder/userfiles/files/radevidukidut.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16142cf65d5bba---68408744154.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/vaxogazoxazosepekopejug.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16138c006a79a5---82107417462.pdfIn PDF document text
    • http://turksebruiloften.nl/userfiles/file/66753668406.pdfIn PDF document text
    • http://a2kat.ru/userfiles/file/53154314427.pdfIn PDF document text
    • http://razzledazzleevents.in/userfiles/file/nowomakesewevor.pdfIn PDF document text
    • http://protectakoteasia.com/ckfinder/userfiles/files/teletig.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161437baf88b24---2306394835.pdfIn PDF document text
    • http://kbfrutos.sk/images/_file/zezifufewawufidila.pdfIn PDF document text
    • http://oldmotorsclub.com/files/file/voxune.pdfIn PDF document text
    • http://ux02.wadhost.com/js/ckfinder/userfiles/files/dalotorakolaletarute.pdfIn PDF document text
    • http://cocoal.com/uploads/file/25291041393.pdfIn PDF document text
    • http://commsoft.nu/demo/ktb/wsmbilder/files/31090909394.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/92f42b20db8a11d27d6c073a1536b59e/9554270155.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/3428565326.pdfIn PDF document text
    • https://www.grdr.org/paidel/ckfinder/userfiles/files/75550796547.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/m3ugu2gbofss04s6qs7ftm7cr2/xujexenapajukuwazozena.pdfIn PDF document text
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///49335663223.pdfIn PDF document text
    • 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_off0000d6e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E0 19044 bytes
SHA-256: 0e2d8cedbedccc54e07c0a76db46b66d26c1b7fbea95d5d9d536edbc2d5de25b
font_01_sfnt_off000106f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F0F 10696 bytes
SHA-256: e88e7f3adc93964d154c05fbc3abd6208ebe314f0ada41c2d0871e831f30475b