Malicious PDF — malware analysis report

Static analysis result for SHA-256 d373a5ec684c03c0…

MALICIOUS

PDF

90.7 KB Created: 2021-07-04 11:51:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 190e4c22bc9abfe92009cafefa025ebd SHA-1: 9d71cf3d93afbafa2f9ed60ff9cb9d2a7e20784f SHA-256: d373a5ec684c03c04f9f2f17abef0e67e7ef7de43c187802a4dd3b66acc67d25
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF 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 many URLs pointing to compromised WordPress sites and disposable hosting. The document body is heavily obfuscated, preventing analysis of its specific content, but the overall structure suggests it is designed to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/9cc39e8eaf0fa18165e5d73f9cd6d190/90956012738.pdf
    • https://www.apollopowersystems.com/wp-content/plugins/super-forms/uploads/php/files/4db03acd8a20d6483bc6660a31bef9a1/66393251782.pdf
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/d9eb3281484f6a1016fe88a43f0b59f5/mevowexezu.pdf
    • https://watosaphotography.com/app/webroot/userfiles/files/20210627_211521.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/013d66f23f3fc44f4b13d66314c1a8c3/kerupix.pdf
    • https://eletvital.hu/uploads/files/87976705342.pdf
    • http://comp-art.ru/userfiles/file/32643173217.pdf
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/icl4g0ers7iul9auikcedk1nk8/2841120090.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16072b5150f074---75126971445.pdf
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e68d2704f5---wepuwadamupopat.pdf
    • https://kar360.com/resimler/files/21216894163.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16080d8f55120a---fijuj.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b922eb30083---darafegukivugox.pdf
    • http://derma-dts.de/files/file/xexoxepaxetifobobudap.pdf
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/b56043ae3f1ba470095410848192b40a/zemetavibevogopelavad.pdf
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607e824dec0c3---zofavewomowumowu.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ce34af0defd---89637148063.pdf
    • http://ceomit.com/fckupload/file/40529962764.pdf
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7dd80a617---27956470677.pdf
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/03b50fc752ade20998e43ea6e802278d/48350861538.pdf
    • https://artasedanasingaraja.com/uploadfck/file/wotenotalubowoxovunu.pdf
    • http://coumert.com/images/file/mevoxuvipowa.pdf
    • http://michellesmithscott.com/clients/36670/File/21074356957.pdf
    • https://diarch.in/WYSIWYGImage/file/meviv.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5c6bae73c---dudixojifagiribuz.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=istanbul+athens+flights
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000feb7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB7 16792 bytes
font_01_sfnt_off000116c9.bin
5191a25f36cb66603c7a19f3b2afeef454b5ba1bcb48d67356d272fc38546ab0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x116C9 17376 bytes
font_02_sfnt_off00014428.bin
bdc98b7859e4fd9ea09e7826a2b6e965fdb5bf06d8eb392116fc7e970af33442		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14428 10464 bytes

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