Malicious PDF — malware analysis report

Static analysis result for SHA-256 f20236ff232f1790…

MALICIOUS

PDF

81.2 KB Created: 2021-09-12 07:15:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2a5a23a5f51f1a92957be48cc40470ec SHA-1: c0d7c4d54c2451be0b10fff0377f5aad5f9ae9d8 SHA-256: f20236ff232f1790882bdfb04fbc92f6f86d30e537b4ba1712a6b1861871b370
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as a phishing trojan. It contains a link farm with numerous URLs hosted on potentially compromised or disposable domains, suggesting an attempt to lure users to malicious content. The presence of a download button heuristic further supports a deceptive user interaction.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://joelcsimonesq.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/9596949624.pdf In PDF document text
    • https://trouver-une-ssii.com/img/pics/files/vatazakasawunem.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/b017488082b6aa84e6bd4a1b9d74587c/57525364643.pdfIn PDF document text
    • http://www.mustwalge.ee/data/content/files/nikojusalif.pdfIn PDF document text
    • http://foto-preiss.at/upload_files/files/vakiruvukam.pdfIn PDF document text
    • http://apisicul.com/userfiles/files/87455182887.pdfIn PDF document text
    • http://diennuocdanang.com/uploads/image/files/nodewewesag.pdfIn PDF document text
    • http://szyoujin.com/UploadFile/file/20210907004930401.pdfIn PDF document text
    • http://newabel.com/ckfinder/userfiles/files/1596264210.pdfIn PDF document text
    • https://laflammerouge.ch/userfiles/files/25801938359.pdfIn PDF document text
    • http://fishngrill.iorderfoods.com/uploads/files/sobebugati.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161332d91518d9---78254880121.pdfIn PDF document text
    • https://psychotherapie-coeppicus.ch/userfiles/files/22187898694.pdfIn PDF document text
    • http://huabulaw.com/uploadpic/2021-9/file/2021090705092873499.pdfIn PDF document text
    • http://5mal4.de/moneyvidya/web/images/userfiles/file/xifoxa.pdfIn PDF document text
    • http://ad.ditroinfotech.com/laportal/ckeditor-ckfinder-integration/uploads/files/menefegaronifazejoriguk.pdfIn PDF document text
    • http://seatraderhk.com/userfiles/16422704759.pdfIn PDF document text
    • https://nevjegyzek.eu/uploads/file/16230090110.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/lozudodalesozemaze.pdfIn PDF document text
    • http://vietdubai.com/userfiles/file/jajogenukavirosikeruke.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133a492d14d2---tonapufenaxe.pdfIn PDF document text
    • http://budka39.ru/files/jirotujasamepufale.pdfIn PDF document text
    • http://area100impianti.it/userfiles/files/fuzizozujo.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613860823debd---kifovifukoge.pdfIn PDF document text
    • http://byecook.com/ckupload/files/85229433564.pdfIn PDF document text
    • http://getvisa.ru/images/File/63403025868.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=launcher+for+android+4.0PDF 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_off0000d770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD770 18244 bytes
SHA-256: 959e400d11ff135e8101c8278d1bc64a5593e67f25f5e18054dd9ee0f8b99264
font_01_sfnt_off00010763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10763 10584 bytes
SHA-256: d527756c3dbb814e2a749aab9c1415e22a06426f931fb27cfc833f0a1de742c8
font_02_sfnt_off00011f74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1