Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5d43eed97a7189c…

MALICIOUS

PDF

84.4 KB Created: 2021-09-21 12:54:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: adf76eca54af9bf35b4c9e73bb37102f SHA-1: 7ba756c5fe784059fdf7e61968a9825a6df4679e SHA-256: e5d43eed97a7189ca0efb954390055e514fa7f33a804d2f217ad79a6308b4535
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to potentially compromised websites and disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is unreadable, but the heuristics and URLs clearly indicate a malicious link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://hanart21.com/files/userfiles/file/67206061437.pdf In PDF document text
    • https://festacontinua.it/public/file/wifejanupu.pdfIn PDF document text
    • http://primeasset.hu/fileok/file/sejaribesasadijifurujobe.pdfIn PDF document text
    • http://trinitysportsandleisure.ie/userfiles/file/rutat.pdfIn PDF document text
    • http://dribblebar.pl/userfiles/file/ponuturuvisevep.pdfIn PDF document text
    • https://ytdrive.com/CKEdit/upload/files/padabubikafege.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/bimezepizuverudova.pdfIn PDF document text
    • http://9275522-travel.com/userfiles/file/vobabomapasogiremifalafob.pdfIn PDF document text
    • http://travelspace.pl/userfiles/file/navowiso.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134c06665536---nomelesozejezirikunaril.pdfIn PDF document text
    • http://matras-devison.com/upload/file/84998012847.pdfIn PDF document text
    • https://webvitamin.vn/app/webroot/uploads/files/fojosinituzutazijumajupiv.pdfIn PDF document text
    • http://reklamavysocina.cz/UserFiles/File/23692465670.pdfIn PDF document text
    • https://fundacjanadzieja.com/images/wyswig_images/file/foxafegikirijekep.pdfIn PDF document text
    • http://studiozoppini.com/userfiles/files/33613542504.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/jibevilarijik.pdfIn PDF document text
    • http://zoldjogsi.hu/uploads/files/49318576850.pdfIn PDF document text
    • http://unseretochter.ch/images/file/fulokuwamilazu.pdfIn PDF document text
    • https://futurefacesnyc.com/uploads/file/57203507435.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614879687abaa---20228386709.pdfIn PDF document text
    • https://xedulichhaiphong.vn/images/news/files/63552220920.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161412bb9efe14---18518838440.pdfIn PDF document text
    • http://yizhu580.com/ckfinder/userfiles/files/65252373849.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/rakewebuj.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/10141647720.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e208c15576---jawovevafe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=ww2+sandbox+strategy+and+tactics+mod+apkPDF 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_off0000d97a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD97A 11460 bytes
SHA-256: d6066b3ac58f2931ee54cc984d84ae69ffbac8c28312ed5c21ebc095c18a07d8
font_01_sfnt_off0000f44d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44D 20616 bytes
SHA-256: 5a5f1a3528b6ddc65a3e010c043e60d833248de7f4780c0a51e6659598886eb3
font_02_sfnt_off00012aff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1