Malicious PDF — malware analysis report

Static analysis result for SHA-256 f24d9305f5828e5c…

MALICIOUS

PDF

89.1 KB Created: 2021-07-07 21:08:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7bb8232bc46435444b4f318b93787de7 SHA-1: a86f59cfa40d5279fbeb5ce5cfd49f371630dc4a SHA-256: f24d9305f5828e5c83de4115bb2a359b367314a6a6afd8970ff1fe8fdb287abc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress uploads and other disposable hosting sites, suggesting it's used to distribute phishing content or further malware. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of exploitation or redirection techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://decaiyun.com/upload/file/2106250047433695137t5c1s44m0fm.pdf In PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a09c931a796---lemuwuwi.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/e6c454b88d5ecdf89b263ac251d59de7/kelepakuviwevokofu.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160bf7f553c7c3---80161877381.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c509910c5c9---75956021343.pdfIn PDF document text
    • http://krzysztofmalec.pl/gfx/fck/file/vividavujopazo.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/eka81oo3mnl4af8kp5sb58iai7/bowogovibegusafafozavi.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/72581422822.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/9r282s6ifn9tgf8m7bp80e2bdh/83132304179.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a721d697dc4---11722359946.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/a9d18fc0061a0b3b802236e11f7a9870/zejuxunonuxiziru.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/zufamuwamaxifen.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/85186508611.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/88099919658.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/fetuxoda.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/70195064096.pdfIn PDF document text
    • http://xedaptheduc.net/app/webroot/uploads/files/kinunaz.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/ca579e4397fda01444f3e9ddd846f3bc/wafameba.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6670cedd23---nakebunu.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/45483775990.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/96625661106.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/31032b0bcc800528ce47ff49d221a939/manajuzupejabemo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=new+issue+market+pdfPDF link annotation
    • http://irodori.kir.jp/files/file/dozigejesepufuk.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_off0000f81c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001102e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1102E 17748 bytes
SHA-256: 8478a09b239906cbabb8280ef414f83d96ee2d883c37c308423b73cc27cac98e
font_02_sfnt_off00013eea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EEA 10644 bytes
SHA-256: 6ddd527c4818ef54ff59715c3f42cdfbfdd43dfd55e932949fe18e244c12eedf

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