Malicious PDF — malware analysis report

Static analysis result for SHA-256 951a7253f76dbec1…

MALICIOUS

PDF

93.5 KB Created: 2021-08-09 20:01:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a745b8fea138f2a81196efc1efd8be8e SHA-1: 60ab84d02d86a3fb3e2eb502e20b779c44a54a84 SHA-256: 951a7253f76dbec151c67cb1c4a067b2c80d4c7d6399f6383966ac70143a06cc
156 Risk Score

Malware Insights

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

This PDF was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to various domains, some of which appear to be compromised CMS uploads or hosted on disposable domains. This suggests the PDF is designed to redirect users to potentially malicious websites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • 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 http://bjsprt.com/uploadfile/file///2021070322575885.pdf In PDF document text
    • https://okinawa4d.com/contents//files/wogutigar.pdfIn PDF document text
    • http://lbassicurazioni.it/file/21761466619.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/a647e52cfe8f95bf59b2eb427bc61749/1559831358.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/pofalelegebuxivup.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/mudekalavanopo.pdfIn PDF document text
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/41909226379.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610d52d7f3ecf---bipedona.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7178ce8a47---69476144292.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/a5f2141dd98920f791c93586de0e6f6c/83943074521.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/6072d6bb5bda180ac2ab545ab320af96/movizutemesumoxaniseboza.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/97222317909.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607b983879cf5---3745667925.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ffbdcea6d---jozusilogojovewala.pdfIn PDF document text
    • http://art-ball.net/files/file/zukogevige.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/xerudabadejakakulok.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/ebb43d6a9d9ee0625bf1f70438b43ed8/pufojifew.pdfIn PDF document text
    • https://fairtradeportal.pl/userfiles/file/wokoxalatina.pdfIn PDF document text
    • https://daotaolaixesontay.com/uploads/file/kerim.pdfIn PDF document text
    • http://cesmclassof68cheyennewy.com/clients/82478/File/fuvuwusazuva.pdfIn PDF document text
    • http://xiaohecollege.com/d/files/362479052.pdfIn PDF document text
    • https://www.ewdel.cz/ckfinder/userfiles/files/zovobubikopokakoware.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=java+string+format+double+remove+trailing+zerosPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F0 18468 bytes
SHA-256: b8f7e824dfff62788fc531142640674801c40f38495f8b1c1313a3fe32fced3b
font_01_sfnt_off00012b3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14355 11056 bytes
SHA-256: b4639c59469a3b0c787fcce4e8153953f2a40387ddc3d9d2128a63d9953ead42
font_03_sfnt_off00015ce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CE7 1696 bytes
SHA-256: 18d4e792ecce3f905fa2ab451ccfd49c5848bf831e68a40b7d1f99915d932e98

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