Malicious PDF — malware analysis report

Static analysis result for SHA-256 d06af565282d5c08…

MALICIOUS

PDF

70.7 KB Created: 2021-09-02 18:30:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: fb9bf5efb71e42c57c064968d9f3024f SHA-1: c1e8fdc797212b8e7d1e88eba15fdc7985a517cc SHA-256: d06af565282d5c08acdc17c66ef374c1bfe574918c9942ab7cfba6967b28e298
176 Risk Score

Malware Insights

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

The PDF is identified as an image-only lure, a common tactic for phishing campaigns. It contains numerous links pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 70 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://huiking.cn/uploads/file/301614344332.pdf In PDF document text
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/zuwanalaviragodizukevog.pdfIn PDF document text
    • http://clearspace-design.com/CKEdit/upload/files/71018757028.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16081665595bbd---67990000918.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/02111c8ad34a4677651536de386a4fdc/bikaru.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16093d50bf1bcf---95213457266.pdfIn PDF document text
    • http://tutek.eu/userfiles/file/jadoke.pdfIn PDF document text
    • https://ismart99.net/upload/files/niritatebowepoduk.pdfIn PDF document text
    • http://jngf.cn/files/file/zosiki.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/9f2dbc09cf39dc5bbd8243d546f4c121/bipulenejedidajilefu.pdfIn PDF document text
    • http://tucsokszekszard.hu/images/news/file/zixulogoxi.pdfIn PDF document text
    • http://cjcounsel.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/34548388938.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/731a32010fe678a1b53c8e1468c3a5c7/80157868613.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/156123bfc3ef59d9b3c7d13324747aaa/61184172441.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/39749829859.pdfIn PDF document text
    • https://synersys.fr/contenu/file/983851341.pdfIn PDF document text
    • http://alvitraders.com/files/xutigor.pdfIn PDF document text
    • http://businessnavigator.in/ckeditor/uploads/files/39667916418.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/6584fdf5f0b69bd9a0c23b594cc2617d/demozedavogixewurob.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/8a7d9754945e4bc7307fe435a6c72d8f/38993835320.pdfIn PDF document text
    • https://lecachet.fr/docs/files/sepoligo.pdfIn PDF document text
    • http://xn--9i1b14l32gg2dsybq3b.com/upload/fckeditor/file/50710767335.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-8-6/20210806032325530731.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/u7f5bthg1qmp7m6l1e8083higa/58513990572.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/losilejofenuni.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/tepid.pdfIn PDF document text
    • https://pilot-nav.com/ckfinder/userfiles/files/gejularikibamutavi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=zerodha+brokerage+charges+2018+pdfPDF 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_off0000b795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB795 14088 bytes
SHA-256: 27f3bc192a613b7ec53f42c3f7f1680c9657d2f8975aa2e54e9ac9f048ef5542
font_01_sfnt_off0000da63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f27a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27A 11256 bytes
SHA-256: 5e43727a840480a8780600339d0d302a6f03413153f26784035d5bd036d1dadc