Malicious PDF — malware analysis report

Static analysis result for SHA-256 adb4dd18ae138a58…

MALICIOUS

PDF

72.8 KB Created: 2021-09-03 03:14:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: eb4d15e73da9ad8e9e72e50fe2555f6a SHA-1: 1c68676bd0f21ac12716ad9748785fef0fdd7e05 SHA-256: adb4dd18ae138a5847b28a0b59ed1d18a9c07dbc5d6b78086612d613b7281d61
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting it's designed as a link farm to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://chcial.ru/uplcv?utm_term=logicism+philosophy+of+mathematics+pdf PDF link annotation
    • https://chung-pei.com/userfiles/file/99070035277.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b97b76e125---rapebizaxudugujawaleko.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160810ea5905f0---bidevuboguxoreturi.pdfIn PDF document text
    • https://dsverano.com/UserFiles/File/45382568664.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8b8948fb6---fixevimufozirajopalogewoz.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/7afbf5a76cd4a7ad07d35d575376fcb9/18607953922.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160945ae0541ba---185875020.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/2e7edea9d19dad07fcd01bf11e8a3c27/nexuzewaxepolodukolelog.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/3e8cdb123f5296c7c143894fcf3a5cf3/50616311518.pdfIn PDF document text
    • https://evboosters.com/wp-content/plugins/super-forms/uploads/php/files/fc83cf9c0d310dc928844335125dafa9/limivufiwike.pdfIn PDF document text
    • https://argekaucuk.com/nbg/upload/files/54624455951.pdfIn PDF document text
    • https://www.ijmsir.com/ckfinder/userfiles/files/lujazujotirixufokureked.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab0f8138210---zumitovonibawa.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4b86e4ac6c---zuvidoverakev.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7f6443af8a39036ac9925d3eada1f98c/lixibip.pdfIn PDF document text
    • http://vngo-cc.vn/cooker/public/files/86265366918.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1606d65a5a459a---50200660342.pdfIn PDF document text
    • http://africa-emergence2019.com/userfiles/file/dodijera.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/4897bd2ccd06170cb119a70b2227d2c8/50162228473.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/4c26e37b23f362b4de262a7506fff776/39710761486.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_off0000baab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d2c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2C2 10936 bytes
SHA-256: d3c160783c95f0dbe049fd0f148c05e49d685872d3bb1bb1d70a63595fcb00bd
font_02_sfnt_off0000ebf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF1 16272 bytes
SHA-256: 9841eb9cab2e340fc4e87669e878feb9074529ba44f6d325568c677a15b68aa4

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