Malicious PDF — malware analysis report

Static analysis result for SHA-256 624231cfd51f0b2a…

MALICIOUS

PDF

74.6 KB Created: 2021-09-07 11:35:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5efcccb8d4e74bcffb80aa626b73daa0 SHA-1: 5ff6d4d050aeac8e556ccf5789f528b54196b48a SHA-256: 624231cfd51f0b2a46b3f7ffd5e9fe1b05ea85f93a645c20483a4c718667f0f8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript and a significant number of external URLs, many of which point to potentially compromised websites or disposable hosting. The presence of JavaScript and the link farm structure strongly suggest an attempt to redirect the user to malicious content, likely for phishing or malware delivery. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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://bankkartya.hu/js/ckfinder/userfiles/files/35025891140.pdf In PDF document text
    • http://srutimusic.org/userfiles/file/72571315865.pdfIn PDF document text
    • http://jfk1969nola.com/clients/873000/File/75915049188.pdfIn PDF document text
    • http://xn--80aaaaadfwa5aftjhxrkcrg8iwc.xn--p1ai/pict/file/kixumak.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/4d35be3f3d7d35b780dad7f93b6d3ecf/15850566782.pdfIn PDF document text
    • http://www.bluefashion.cz/ckfinder/userfiles/files/jifipisiwox.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/83049619346.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/2e9f413766fc77419e210fae3d5c3a82/56671762003.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-9-2/20210902072818950786.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1612c1f8cde59a---velezolu.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/km96gtfj4lvgb3pdbv6beqe3ft/48362372030.pdfIn PDF document text
    • https://westhigienia.hu/editor_up/xenir.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/a2e7f74b45cc4b154cea23d29eb3d21d/fogozalimuwolesazu.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a5ecc152a---56754773469.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/a891370f6199987753d5c66349ce2b86/75870687597.pdfIn PDF document text
    • http://slphs66.com/clients/e/e6/e62fa13cff665df70d7481f632b33819/File/16124407853.pdfIn PDF document text
    • https://wsbtitan.com/images/file/xuzugejepuja.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d498693ab---56461960451.pdfIn PDF document text
    • http://didocrosby.com/imagenes/file/vijogi.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a92ef2bfe---luradikegamajubaf.pdfIn PDF document text
    • https://paardenwelzijnscheck.nl/app/webroot/files/ckeditor_files/files/rizopokupupugiduvefoza.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160701e174ef1e---10204086164.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/d55fb138b224ce8bc33ca3e4870fac1a/72372060323.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3e19b8b2a---rasevikabifuwizibukosita.pdfIn PDF document text
    • http://thermocomfort.ca/userfiles/file/jeluwuren.pdfIn PDF document text
    • http://cooperclassof1970.com/clients/9656/File/99165129068.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/26735529353.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/92j6g01d4ciu6o42ve3551kher/zasomepakumaxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=pdf+redaction+failurePDF 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_off0000c48e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC48E 15984 bytes
SHA-256: 4b3b24f5d0c2c47be87276e7a1ba3022f08424b483b5cb82d11daf62262b0c49
font_01_sfnt_off0000ed4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10563 10400 bytes
SHA-256: bd3d708e2ad2ebbf8781595d11e01853a7bbfb294d90c27d2d2d4be54c2fac62

Open this report in the interactive analyzer, or submit your own file for analysis.