Malicious PDF — malware analysis report

Static analysis result for SHA-256 665cb3a8ff5dacaf…

MALICIOUS

PDF

82.3 KB Created: 2021-09-20 05:03:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6f11eabe8217585108da4f0fa212cade SHA-1: dec3a83d8d58cff1416ed18498cb3e3ad9b995d6 SHA-256: 665cb3a8ff5dacafe339d6e6c9fd66fac5db4da4e9f06059c5e25f62f68e6a7c
172 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to potentially malicious files hosted on compromised WordPress sites, indicating a link farm designed to trick users into downloading malware. The ML classifier and ClamAV detection strongly support the malicious nature of this file. No scripts were extracted, but the presence of a download button lure and the link farm strategy are clear indicators of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://phutungquanghieu.com/app/webroot/files/ckfinder/files/tomagajukufap.pdf In PDF document text
    • http://ebonit.light.bg/includes/libs/ckfinder/userfiles/files/remigusekunexenij.pdfIn PDF document text
    • http://thamcohoaian.com/webroot/img/files/dovuzipokapigekepat.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/42191836276.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/dff64dd1685bdc89cc74f6d43c5035ef/kedidinunagirixu.pdfIn PDF document text
    • http://plaschke-partner.com/uploaded/file/rawumikik.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/34064347717.pdfIn PDF document text
    • http://wahluenfty.com/userfiles/8663155994.pdfIn PDF document text
    • http://origo.ws/userfiles/file/38239349120.pdfIn PDF document text
    • https://satuldelut.ro/ckfinder/userfiles/files/kuxijoxejaxezinidejasava.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/fabazovokofizujowo.pdfIn PDF document text
    • https://beauti-full.ru/uploads/files/xelotezosizofazudalogo.pdfIn PDF document text
    • https://spheresignal.com/app/webroot/userfiles/files/15006004900.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161357b5195a2e---mabedalanowoveri.pdfIn PDF document text
    • http://traktor-tv.de/sites/default/files/file/wubukotomenukuzokebotika.pdfIn PDF document text
    • https://indiantalentjunction.com/milan/media/6429893222.pdfIn PDF document text
    • http://www.css-jp.com/upfile/files/2021/09/02/nezutekopasigenagunofi.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/66657028632.pdfIn PDF document text
    • http://volareinmongolfiera.it/userfiles/files/90535357875.pdfIn PDF document text
    • https://motty-etai-sharon.com/files/files/zexawujuzozuga.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/kbm78j25jv7hm3ifgruqhaoqj6/rozogesituwipifip.pdfIn PDF document text
    • http://eko-gospodarstwo.eu/files/file/53701205706.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/kinosaxekawavokafani.pdfIn PDF document text
    • http://mensagemcrista.com.br/ckfinder/userfiles/files/medevonukeruzujorabu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=earth+live+wallpaper+androidPDF link annotation
    • https://mediacentre.heathrow.com/js/ckfinder/userfiles/files/duxaxufiwinejizatitonagam.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_off0000de2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f63c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF63C 17504 bytes
SHA-256: c219e1abc1a066738fa16befb333465468989b2319946d9136b1d39206349cb2
font_02_sfnt_off00012392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12392 10456 bytes
SHA-256: 4268c4227fbfa974ff611b403caeb73cca3e95a3bb874fb32b2b82a648c5b023

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