Malicious PDF — malware analysis report

Static analysis result for SHA-256 434cc7927357e16f…

MALICIOUS

PDF

151.4 KB Created: 2021-07-22 17:58:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c1bb082a48a29a162db8f36b2dbc1dc3 SHA-1: 6cbc6c7ea0a5bd0e33ebe1fa390aea88ece71f2c SHA-256: 434cc7927357e16fde02a8d0dc137c0dbbea2069e9104ffd1f669d797ba2cb6f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as a link farm, directing users to numerous external URLs. Several of these URLs point to compromised CMS uploads or disposable hosting, indicating a high likelihood of phishing or malware distribution. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9770

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://short-story.ru/upload/file/kutomajeteneven.pdf In PDF document text
    • http://zetrade.cz/userfiles/file/pimololegasuk.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/68a52402102e95df9e78c9613dba3691/32115884601.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b8579e87db3---48376347845.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/pizaxojafagum.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/r6a75n88cqspb1jdqdqvsrqa91/mafodenapizogadanesuraji.pdfIn PDF document text
    • http://alkanboya.com/files/file///kubabepawupizi.pdfIn PDF document text
    • http://ponderosaclassof1990.com/clients/d/d5/d5d19f6fc184e1fdd834fc62be9f1763/File/tolomawetakiwosodemagujiz.pdfIn PDF document text
    • http://aexpress.lv/index/images/up/file/kibag.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160947a484bb68---kixelewarigi.pdfIn PDF document text
    • https://clubsecurite.fr/webroot/upload/files/98803655248.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/jubosodenizopuvaz.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/70736a0dc6d96f25192d1f6b88e029ee/44265774017.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/886691be3c256b234c7246abf77597be/tarupegoboropewexodofak.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/39dda83c0feb9e510e8d0d56dbe5a8d1/53434240211.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/t1tndcb3m7kqnj76suigraqjdp/sanepebaviwug.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/104ccabb9a6999c8263c2877d2ebc988/gaxukerejapoxezi.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608926be82f96---rutolimozurufidodakedep.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/mawupevawoje.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/27i31ogd7m1s71nili4jinu662/welojadatuvul.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/58925720587.pdfIn PDF document text
    • http://promador.pl/userfiles/file/folusaboza.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607132c5843d8---jogunizosasipazogosuz.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/ff091074b36b454566cd88af76a7dbb2/88061797223.pdfIn PDF document text
    • http://tribo.kz/userfiles/File/xesukorepu.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/jexugimesoderugipuso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=aaa+follow+up+guidelinesPDF 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_off0001f066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F066 17808 bytes
SHA-256: 3114d2c486d696aa4c74106b86ccee38e8f78ecb8ea263452d3d43afc4648a5f
font_01_sfnt_off00021e4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21E4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00023666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23666 10644 bytes
SHA-256: be6bc39d2b4e4bdc5169aeab0b65c216afd4f2ae4c68ba06a69590c5deea6bea