Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9a349baed5cabb6…

MALICIOUS

PDF

70.3 KB Created: 2021-09-18 19:03:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2abaa74fc9e5e51bad9ed158b229aaec SHA-1: 07951a56f5d9c55a063061523ca489949fa73fac SHA-256: c9a349baed5cabb642ef2e222e78a7a8a9b3995b9475e0ccb535d6f487d44597
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate an attempt to lure victims to external sites for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://pixomot.ru/uplcv?utm_term=email+notification+not+showing+android PDF link annotation
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/e57cb9cdc06bee9b7a22520f720f759f/beloxaw.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/texurinejuxuwupunifekuxo.pdfIn PDF document text
    • http://a2hgghk.handylover.com/upload/files/nanikovevefudozoxap.pdfIn PDF document text
    • http://florylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ditipalovoxodavemavip.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/kumomuz.pdfIn PDF document text
    • http://elskenecologie.nl/files/67393400812.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/bowokeweredete.pdfIn PDF document text
    • http://hidramaco.com/files/files/42768518016.pdfIn PDF document text
    • http://szilasfood.hu/pic_upload/files/8418221550.pdfIn PDF document text
    • http://haphadoor.com/upload/files/44084078903.pdfIn PDF document text
    • http://songdolandmarkcity.com/userfiles/file/4577134910.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/61279393807.pdfIn PDF document text
    • http://dieukhactransam.com/uploads/files/64774226940.pdfIn PDF document text
    • https://pabxlg.com/userfiles/file/84596347628.pdfIn PDF document text
    • http://33podarka.ru/pictures/files/66817951295.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210905232828.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16144e590cabbe---pibuza.pdfIn PDF document text
    • http://graficaeformazione.it/userfiles/file/dojepesefokexa.pdfIn PDF document text
    • https://digicpictures.com/downloads/8773523506.pdfIn PDF document text
    • http://www.benyowsky.com/resources/files/libekuruv.pdfIn PDF document text
    • http://jtravel.clickis.kr/FileData/ckfinder/files/20210913_9DAA0E1AEFE24BB3.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/dezesuvef.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/12f1d8af2675da8db8b2ab5643a3e6e3/3833144294.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_off0000b3c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBE0 10860 bytes
SHA-256: 6609ddd0b7a342d215b055b863e7201d5fc5cf556e95d2c370219e1f4186fcac
font_02_sfnt_off0000e48f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE48F 15324 bytes
SHA-256: c5e12eb197ae74e59ad09425b6fc333f92ef350e0302d1266ca327979bdd462d