Malicious PDF — malware analysis report

Static analysis result for SHA-256 42243909afc7c800…

MALICIOUS

PDF

83.3 KB Created: 2021-09-16 07:08:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4756efa8fe6802245b6252a551576797 SHA-1: 85a204e61f6a52a6092e180f16ff555c80f398df SHA-256: 42243909afc7c8002126096ec9c01f0a3c17945ef8b4b654f4f386588b2ef663
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised WordPress installations, indicating a phishing or link-farming scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://philabc.ru/uplcv?utm_term=app+tipo+excel+para+android PDF link annotation
    • http://tydafa.com/dafa/uploadfiles/20210907202938.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210915_70731759CEFA76A8.pdfIn PDF document text
    • http://ggbris.com/slbdavbatala/userfiles/file/68796144943.pdfIn PDF document text
    • https://tsydesign.com/userfiles/jws/files/57949279092.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/161387d5ef3c7a---jibosudevozunibobarap.pdfIn PDF document text
    • http://dailycan.com/userfiles/files/zofuxabebovamemobizivule.pdfIn PDF document text
    • https://spa-salon.ru/ckfinder/userfiles/files/jelamowagoditezemewozu.pdfIn PDF document text
    • https://kampusogrenciyurdu.com/file/41123099377.pdfIn PDF document text
    • https://sukaunited4d.vip/contents/files/zinusimuwi.pdfIn PDF document text
    • http://banphimchuot.com/userfiles/file/60241468807.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/wekiduzus.pdfIn PDF document text
    • https://marupyara.com/fotos/userfiles/file/48178540133.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1613402a131e6f---rasamisikamirud.pdfIn PDF document text
    • https://biholka.cz/uploades/userfiles/file/buvikuzejal.pdfIn PDF document text
    • http://german-ex.com/images/blog/file/ziwadupepokijufomeg.pdfIn PDF document text
    • http://3wsystems.com/shipinc/userfiles/files/fufowimudakuvujoj.pdfIn PDF document text
    • https://ariconium.cz/webpagebuilder/ckfinder/userfiles/files/giwejuretarara.pdfIn PDF document text
    • http://vsrru.ru/userfiles/file/tosunaleliwanidowu.pdfIn PDF document text
    • https://beytarimcilik.com/admin/editor_resim/file/35399683807.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/0460152b6ada1b80c75232cd132c9b02/26083704704.pdfIn PDF document text
    • http://firewaterdamagedfw.com/test/fckeditor/uploadfiles/file/wafigaralamo.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/14381196048.pdfIn PDF document text
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/37299613819.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_off0000df1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1A 18768 bytes
SHA-256: 82104b9693f2555dc0c000f67615424ced79e0644e615bfab8be2ead5f333185
font_01_sfnt_off00010fec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12803 10420 bytes
SHA-256: a03dd3ba9b4b5908262203797f793b74dafb945bbd14c343ec7145b8f6c30e3c