Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b324309e8562d4f…

MALICIOUS

PDF

83.2 KB Created: 2021-09-21 17:33:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: fa58075835cefb7f91b2255372552597 SHA-1: 34b64f2a225769619273c35fadbd2fab30a47cac SHA-256: 1b324309e8562d4f1b34cb83909c5aefa55af408b9fb4b9c45c5a76d675e1946
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs, many of which point to compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://bibonatura.hu/ckfinder/userfiles/files/74764652863.pdf In PDF document text
    • http://generale-bureautique.fr/gdb/files/file/timikejojakimo.pdfIn PDF document text
    • http://theartofdesign.nl/ckfinder/userfiles/files/63331110532.pdfIn PDF document text
    • http://warehousetraining.ie/images/dazulam.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/7b334d3c67ed5505d49e3f17bfb91998/jigopoperogalibase.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021091015210773499.pdfIn PDF document text
    • http://vladekoservis.ru/files/94322762862.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16139b7cb1cbdb---tujotalojulodut.pdfIn PDF document text
    • https://heritran.vn/uploads/news_file/raberabamamuziwopapop.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/11422771071.pdfIn PDF document text
    • http://metroboxservices.com/upload/ckimage/files/92767601282.pdfIn PDF document text
    • http://noithatachau.vn/webroot/img/files/nuxan.pdfIn PDF document text
    • https://handinhand-daycare.com/ckfinder/userfiles/files/92221687324.pdfIn PDF document text
    • http://bonezi.morefriendship.com/upload/files/37947661105.pdfIn PDF document text
    • http://nedvizhimost-v-sharm-el-sheikhe.ru/uploads/files/49138296084.pdfIn PDF document text
    • http://www.emploi.nat.tn/ckeditor/ckfinder/userfiles/files/mewubimonexikirelewaz.pdfIn PDF document text
    • https://healthlantern.com/ckeditor/ckfinder/userfiles/files/29018119599.pdfIn PDF document text
    • http://babyindex.nl/images/uploads/82352766416.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/161459c2936017---64130059547.pdfIn PDF document text
    • https://proetcontra.hu/userfiles/file/femekupudomaguviliz.pdfIn PDF document text
    • https://wotfiles.com/ckfinder/userfiles/files/48393307377.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-4/20210904104920778564.pdfIn PDF document text
    • http://d-innovation.com/upload/files/11728474819.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/valamuwelapovuxino.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=movierulz+vakeel+saab+download+teluguPDF 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_off0000df9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9E 17660 bytes
SHA-256: e7cec1898efaf4adf7c8af0567f5f74944196a32ae4b5c160814bbfe134cfca0
font_01_sfnt_off00010d43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D43 10960 bytes
SHA-256: 7672847001e2b82e308bbde6f4ce4047c8ac50a6b4f6828c758350e60cf889a8
font_02_sfnt_off000126ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1