Malicious PDF — malware analysis report

Static analysis result for SHA-256 37cac8cfeaac4f41…

MALICIOUS

PDF

80.3 KB Created: 2021-09-11 04:19:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: 13afe50e22e158dd3eac12cb5568b46a SHA-1: 14cf2aa6776349fe4abbd783cc7656bcec1fd9fc SHA-256: 37cac8cfeaac4f413288a85e9c4fc6008557b95be0b542fd3d05648f77b9ca59
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the nature of the links and the detection names imply a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/majidafawadowiris.pdf In PDF document text
    • http://conniecorsentino.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/leronobavujav.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/ka5eu4c9llk1uqh99re0unj8u1/xokasixefopexakamapi.pdfIn PDF document text
    • https://kuzeyilac.com/resimler/files/93267377437.pdfIn PDF document text
    • https://factorysales.com/userfiles/files/diwedobinamabosovitab.pdfIn PDF document text
    • http://agama-rc.com/upload/files/solunedef.pdfIn PDF document text
    • https://tradingphrases.net/userfiles/files/goguxezatikuv.pdfIn PDF document text
    • http://retailpark.bg/uploads/wysiwyg/files/60643551372.pdfIn PDF document text
    • http://zaiger.ru/img/file/gapomelolovagun.pdfIn PDF document text
    • https://unitytradefze.com/ckfinder/userfiles/files/kibizujikoti.pdfIn PDF document text
    • http://fu-xin.tw/uploads/files/202109091207324587.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/bomipuzitosi.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613450075291a---22387558362.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/gunobolijarovitotup.pdfIn PDF document text
    • http://winhazel.com/indigo/ckfinder/userfiles/files/67750062122.pdfIn PDF document text
    • http://whatcanidoforyou.eu/publish/file/kudedajig.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/c28474a2323c2b6b20652ff9797a3a9e/lujezemazubedax.pdfIn PDF document text
    • http://kaushalacademy.org/ckfinder/userfiles/files/51848622189.pdfIn PDF document text
    • https://comtraining.cl/userfiles/files/barisiwuposuwunedapuli.pdfIn PDF document text
    • https://5udua.com/contents/files/bepuxinam.pdfIn PDF document text
    • http://neodentpetrosino.it/userfiles/files/25261908770.pdfIn PDF document text
    • http://ilovestory.com/upload/file/pugoworatijof.pdfIn PDF document text
    • https://vgi-vn.vn/app/webroot/img/files/jipasiwebereba.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd9ca1c38b---lotajakewarexi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=codes+in+genshinPDF 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_off0000d8cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8CB 10152 bytes
SHA-256: 966b6bf799675d8f58ae508c1b8d4ce3345edc6869ce8a8de91af81fc191c151
font_01_sfnt_off0000ef27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF27 17508 bytes
SHA-256: 0644b0dc070cc7c65126f0a8a7f98632cde85108e7efd74eb049dc190b216145
font_02_sfnt_off00011bff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1