Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf47dc0342ebeb44…

MALICIOUS

PDF

80.3 KB Created: 2021-09-20 11:01:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 624beb2e67acf36b66431c07e0108c68 SHA-1: 8bbda6676865834ff43f9234e6d47349b03f9e0b SHA-256: bf47dc0342ebeb44e03b1b79f07feb67cb7ca17e27ec38639c9905755e378fa8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for exploiting PDF vulnerabilities or redirecting users. It also features numerous links to external websites, many hosted on compromised CMS uploads or disposable domains, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • 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.
  • 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://isisthailand.org/file_media/file_image/file/94720643555.pdf In PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e2d239699---tonixuxu.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614657594edbb---79059544079.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/be72558be5bb0cdb65f2a63f31d89b77/zojure.pdfIn PDF document text
    • http://pure-chiral.com/upload/files/tabuvoxetala.pdfIn PDF document text
    • http://vssteel1999.com/ckeditor/userfiles/files/mizonejodeledadapuri.pdfIn PDF document text
    • http://amandatour.ru/js/ckfinder/userfiles/files/55523583200.pdfIn PDF document text
    • http://www.papelerialapiceros.es/ckfinder/userfiles/files/86477181700.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/c1971af3b01afc0ac2be262798ba93c0/resozatalewisevajojemedo.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///202109025852_967840961.pdfIn PDF document text
    • https://szalkasszorutacskok.hu/app/webroot/files/content/files/kujivujomovorefijunafituj.pdfIn PDF document text
    • https://bc2000.order-pro.com/ckfinder/userfiles/files/fusivojunoxisojopotodimef.pdfIn PDF document text
    • https://mirrorlink.com/public/files/files/51257887572.pdfIn PDF document text
    • http://regmac.net/userfiles/files/funudi.pdfIn PDF document text
    • http://www.serenissimaservizi.com/files/59419739550.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/66mpt4708essiqro7gkk79grbv/54231464884.pdfIn PDF document text
    • http://njboyuanchem.com/upload/files/gozovokurali.pdfIn PDF document text
    • https://davidfauquemberg.com/home/fauquemb/david/bbdg_site/userfiles/file/51617177360.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613daa704ee44---zobara.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/jeferepoxijapupe.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210902190601678.pdfIn PDF document text
    • http://unicorn-furnitures.com/d/files/73086243145.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/wosidobigofa.pdfIn PDF document text
    • http://harekatmemuru.com/images/Media/files/juboxowapodudemovufer.pdfIn PDF document text
    • https://www.esicm-old.org/admin/lib/ckfinder/userfiles/files/jukusinesalefi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=clash+of+clans+cheat+codes+2020PDF 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_off0000d1b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CA 10656 bytes
SHA-256: b37ad4e28557d77161995833e1b56caa4e374192c2fed25915d8c1d66d17f1ed
font_02_sfnt_off0001023d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1023D 18620 bytes
SHA-256: 1fb96bcaf74f0a6157453cf5e619eb19fd2ac9ea5194e5dcc3c691098bbb7d25