Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d45c2879ac2b61f…

MALICIOUS

PDF

81.0 KB Created: 2021-09-16 20:00:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e75acef6a4cd684937350768dee1fbb2 SHA-1: 279a89680f2882feae5654e8a733d9080070e690 SHA-256: 7d45c2879ac2b61fc43cc694edd5bed368930d9d9b6da3a64e361ac52b5cad37
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL targets suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://www.hkha.com.hk/ckfinder/userfiles/files/ladofijinojajapavalit.pdf In PDF document text
    • https://tktravelkorea.com/FileData/ckfinder/files/20210911_39FB7BF65E5F1000.pdfIn PDF document text
    • https://etevent.itweald.com/uploads/files/613dd502ec711.pdfIn PDF document text
    • http://salkim.com/userfiles/file/16212832650.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109140506393154.pdfIn PDF document text
    • https://nedimgame.net/calisma2/files/uploads/82040410045.pdfIn PDF document text
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/29898807691.pdfIn PDF document text
    • https://www.wemservice.com/ckfinder/userfiles/files/bekefaz.pdfIn PDF document text
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/33961708857.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161360f68ad206---14251895658.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/161397a22328d9---66797524496.pdfIn PDF document text
    • https://uroci-kursove.com/userfiles/file/27413578033.pdfIn PDF document text
    • http://upoart.com/ckfinder/userfiles/files/36945745926.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/76707665191.pdfIn PDF document text
    • http://stavclearing.ru/upload/files/ramiso.pdfIn PDF document text
    • https://deltarealestate-eg.com/userfiles/file/56235830822.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/66319337966.pdfIn PDF document text
    • http://cofetariafraguta.ro/UserFiles/file/31182801010.pdfIn PDF document text
    • http://profesniprukaz.cz/ckfinder/userfiles/files/11806099203.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/76456969945.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/3ee6a3434eff45de0187323c37d976f1/gerurelajuzizorupikoto.pdfIn PDF document text
    • http://rudolphi.nu/userfiles/file/tebim.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/juserusi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=como+colocar+foto+inteira+papel+de+parede+androidPDF 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_off0000d3b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B1 20036 bytes
SHA-256: 9cbf1b2198e533faca42a1ae6326a6280d8e91011b5cda40d11961e69c29c045
font_01_sfnt_off000105dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105DD 10644 bytes
SHA-256: 9c796f68f5cea539c61bad136710cc610ee97abfd4a90c70568457eaf420f35e
font_02_sfnt_off00011e2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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