Malicious PDF — malware analysis report

Static analysis result for SHA-256 998d9398e007251f…

MALICIOUS

PDF

89.9 KB Created: 2021-09-01 17:38:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b44242928b84d72e80347c967578e63e SHA-1: 350d907d865184546f9e2d5b5db5d1e904994e42 SHA-256: 998d9398e007251fbd73004f50f95bc9cd121d2577a49e0d34e3c0ac7359a5b7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm or phishing campaign. The heuristic 'SE_URGENCY_LURE' indicates the document likely uses time-sensitive language to prompt user interaction. Although no scripts were explicitly extracted, the presence of external URIs and the ML classification strongly suggest malicious intent, likely to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://ketchas.ru/uplcv?utm_term=english+counties+quiz+questions+and+answers PDF link annotation
    • https://mojer.bg/files/30927473742.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160fe4ee464996---dugevikob.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a89fbe11fd4---13124308626.pdfIn PDF document text
    • http://wib24-admin.de/uploads/file/88853483147.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/110icqfp5qo3k25dr2asstv5n5/44081151833.pdfIn PDF document text
    • https://estoniapools.com/contents//files/jivaxuvidonigikezaxutowa.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/sga638tbdvc8ggpi20rtm32et7/riminajipubiro.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/71924191300.pdfIn PDF document text
    • https://groupunsur1.com/contents//files/51318764282.pdfIn PDF document text
    • http://sattamatkapatti.com/userfiles/file/53863773624.pdfIn PDF document text
    • http://motorlustor.net/userfiles/file/91091835537.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/15275196316.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/14574945665.pdfIn PDF document text
    • https://churchofgodinjamaica.org/app/webroot/files/dukin.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/77431056397.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/tikimafe.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a565cbb5f43---gijokubu.pdfIn PDF document text
    • http://fenotropil.ru/userfiles/file/31893189672.pdfIn PDF document text
    • https://iva-vietnam.com/userfiles/file/xunogakukojujodegolava.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac73705706---fijudujenuz.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/90160323185.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b1f1426b126---kagikixelaruw.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4bb136b8e4---nufutaxifilamizexivezun.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/fosunudi.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_off0000f7ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CA 11024 bytes
SHA-256: a18dc4ba3d84c41b42b758188f785b3c3df45bec2ba3c7c2c50ba7c2b5b44ba8
font_01_sfnt_off000110f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001290a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1290A 18092 bytes
SHA-256: 0ddb9d710c307bf28d3ddf0b4816de5581b3325992af280a6ebcefa075c52f1a

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