Malicious PDF — malware analysis report

Static analysis result for SHA-256 34c08db2fdc64e08…

MALICIOUS

PDF

82.8 KB Created: 2021-08-29 13:05:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 9bad0188c263bf6e459a0c20283cc22f SHA-1: 80543aeb38385bc1427bad783e81fdd77f02ca22 SHA-256: 34c08db2fdc64e08f8c085565ed2689eaf29b157a3c938e59d21dd939faa7b1c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites, suggesting an attempt to distribute malicious content or conduct phishing. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://paraglider24.de/pics/fotos/1/file/pujat.pdf In PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/16085245864d9f---podazelukeliwisu.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e382a6c2cb---65180816530.pdfIn PDF document text
    • https://tourpon.kr/FileData/ckfinder/files/20210707_F6125660BBCAC605.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/vunisimizapavofivo.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/9216901219.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/952c42849ed1bc10e560fe8056c4ab38/situtanewi.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/40281682241.pdfIn PDF document text
    • http://jaika.in/images/documents/files/28757626183.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/8fe459080a2440e4d0b499585bd39699/29056802253.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/limezipemabowab.pdfIn PDF document text
    • http://au-coeur-du-temps.com/userfiles/file/42062666175.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/m664rjldtfkvl3te9l2iip0oji/vazatoxexo.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/43fdccb3eeb602004d48c1b765a47456/46608662222.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608a613c4d334---50189047093.pdfIn PDF document text
    • http://scuderieverdina.it/scuderia/userfiles/file/gofaxoreranud.pdfIn PDF document text
    • https://washlounge.in/ckfinder/userfiles/files/zopifetopowisemid.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/5876a4308f60f4b37bf035574f1c8d44/74189172912.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16123aad37630b---ximawojozubivigiduzobe.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082dd0645243---83872766900.pdfIn PDF document text
    • http://csc025.com/userfiles/file/20210612222100_y5u85i.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/47871756829.pdfIn PDF document text
    • https://bharatbiodiesel.com/userfiles/file/jilezosogekororovosasagej.pdfIn PDF document text
    • https://finances-canada.com/wp-content/plugins/super-forms/uploads/php/files/ffd956d794df246ec89f89a04de588b4/39901080565.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0e252bc1e---vokupijajoravib.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b75f8ed765b---68787839592.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/wusukonoxuxavibosinewuwe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=two+sharps+scalePDF 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_off0000dd99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD99 10224 bytes
SHA-256: 1e0c08647049d30fa4a688266ea02d0ea5ffe4c107d701938933689b675e6129
font_01_sfnt_off0000f4c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C7 18368 bytes
SHA-256: c66c52f8907079b750157b0a88866464d685e0c113a3fd3974c69e2c653e3bf5
font_02_sfnt_off0001250d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1250D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1