Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9999226610af820…

MALICIOUS

PDF

83.8 KB Created: 2021-07-31 14:52:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2c2c58a2fb709c6b5d694097876b7c87 SHA-1: d1b5f0ae9e03d1c3eb3425031c5f590b56f1d818 SHA-256: e9999226610af8205ca18cec8f9aec8752a2a67181fee2ee675b66d57514d0c0
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content or for SEO manipulation. The presence of multiple external URIs further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://wastran.ru/uplcv?utm_term=how+to+grease+stihl+fs+56+rc PDF link annotation
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609e8e302f4ed---jezogutipoderixof.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/ganig2e3t6n501jh3ev4g6ri42/janojumal.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/55670595e5c06f557943fb0aa8255746/7570946450.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/bosawonemidarura.pdfIn PDF document text
    • http://auburn-properties.com/userfiles/files/66799331528.pdfIn PDF document text
    • http://www.irrv.org/uploads/files/jiwutomofiti.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/76050084955.pdfIn PDF document text
    • http://designpavelzapletal.cz/files/file/feroxujomaxaforavid.pdfIn PDF document text
    • http://dzstock.com/Upfiles/file/99200193550.pdfIn PDF document text
    • http://ave-france.com/pics/files/pepafugizomalonajapog.pdfIn PDF document text
    • https://noblacklist.pro/web/img/podborky/files/23044664639.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/wumokaludawuwepiju.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160ecac8b16504---74225756084.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/78528849588.pdfIn PDF document text
    • http://rurisnet.org/images/file/towejifukamowuzewixojuli.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/abd0cbf7b15444f9cda3a93f52d591d9/xitinevevaxifi.pdfIn PDF document text
    • http://liavanhaeringen.nl/userfiles/files/purotamevetikunava.pdfIn PDF document text
    • https://aedwea.com/upload/foto/pegusosesemowon.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/zovanazegokunokijadevara.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608c61277ff0d---galoxosisov.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160874d5a932ed---65082385790.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/nesjkb04hjlr7o3hrod4t87q2j/76954982276.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_off0000e362.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE362 17208 bytes
SHA-256: fab2773dee9aa52703b0f91d43e5f51892810eef7e42f66fcd8127b76b62799e
font_01_sfnt_off00011081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11081 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12898 10892 bytes
SHA-256: 4ae11f5c3378b19109b1a19cfd0d3f4c5c0a92b29fe11fac6d4966835a5a1798