Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd0a2d57b625874f…

MALICIOUS

PDF

81.2 KB Created: 2021-09-09 06:09:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d3620ec09e214f9869b7e05a6f1e9d71 SHA-1: b8b8bce517a175c327c4cbf22a8c07951a8f234d SHA-256: dd0a2d57b625874ff322b81df0221bc5f8c67614338299ce606371e82cd4542e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. Multiple heuristics indicate the presence of link farms and compromised CMS uploads, suggesting an attempt to redirect users to malicious sites. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • 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://maekuangudomthara.com/ckfinder/userfiles/files/tapegupejerepiwetudetoner.pdf
    • https://cancelaria.pl/galeria/file/ripoguwexumebedu.pdf
    • http://narcisse.sk/editor_uploads/files/jabimafofofufutige.pdf
    • https://adtw1.com/ckfinder/userfiles/files/batuxewisimadi.pdf
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/43080b86982f54729722ad3e99c62a18/lazumapibumerij.pdf
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16133cb1144f66---lufovazajajigadum.pdf
    • http://gloria-eurex.com/images/blog/file/74101272559.pdf
    • http://siamsnail.com/media/userfiles/files/pelemazifisenoponum.pdf
    • https://louvre.lv/res/wysiwyg/file/22918913572.pdf
    • https://transmilenio.net/datamont/userfiles/file/fexegi.pdf
    • http://hokkaido-love87.com/app/webroot/js/ckfinder/userfiles/files/daxokozu.pdf
    • http://soyaksiesta3.com/userfiles/file/bonojatodamo.pdf
    • https://truongthanhco.vn/webroot/img/files/matiguxinigexelim.pdf
    • http://astorandblack.net/emailer/userfiles/file/91727366249.pdf
    • https://turbooto.vn/upload/files/31113507237.pdf
    • https://shen-su.eu/gfx/userfiles/files/podilejuduzukajumun.pdf
    • http://beijingteye.com/upload/files/48764391665.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1612f21699e420---gosutowegofevenezuxomuro.pdf
    • http://ilksolar.com/Images/Media/files/fejigubepamuluwikajanu.pdf
    • http://lawyermo.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kisadifurogif.pdf
    • http://smsalumni1971.com/apadmin/uploads/userfiles/files/16465331840.pdf
    • https://icbacademy.com/upload/files/22243249651.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613927a86c934---76101662791.pdf
    • https://perfecthospital.org/ckfinder/userfiles/files/janimidaduwifoxuzuja.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=sausage+man+apk+obb
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9ad.bin
812e4af252b322c04f5b4566f3efc29fab5a502cfea8db60dd2c39005b68cfe0
pdf-font-stream PDF embedded font (sfnt) at offset 0xD9AD 17452 bytes
font_01_sfnt_off000106cc.bin
e8d962ee5137a8951e35cfc3e3e6825d4ec6ac6c56867230c79020542236106f
pdf-font-stream PDF embedded font (sfnt) at offset 0x106CC 10668 bytes
font_02_sfnt_off00011efb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11EFB 16792 bytes