Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bbd9448c2a49bdb…

MALICIOUS

PDF

78.6 KB Created: 2021-10-18 18:57:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b3cd76cd821b6967ef4e0aba41c5487d SHA-1: 00b3b6885c2dc4cde4ca8901e87133b3b0241cb1 SHA-256: 7bbd9448c2a49bdb6171f503af3c095b7ca1c43511c57080d3760eea0b8f10a8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 https://cyberbirddog.com/userfiles/files/65437110160.pdf In PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/6799892033.pdfIn PDF document text
    • https://promobryansk.ru/userfiles/files/69859055369.pdfIn PDF document text
    • http://sethhukumchandschool.com/userfiles/file/wotutosumaxese.pdfIn PDF document text
    • http://fillaracingacademy.cz/ckfinder/userfiles/files/xitanux.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614fdf9920b96---83007262517.pdfIn PDF document text
    • http://leton.pl/userfiles/file/66011831532.pdfIn PDF document text
    • https://www.vita-organic.eu/admin/ckfinder/userfiles/files/20688639077.pdfIn PDF document text
    • http://lse.hu/userfiles/file/3789730432.pdfIn PDF document text
    • http://mingzhicc.com/userfiles/files/56369857767.pdfIn PDF document text
    • http://dungcubepgiangtrinh.com/webroot/img/files/63729435007.pdfIn PDF document text
    • http://boston.pl/fck_pliki/file/difamuxuk.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1616138af939ac---65220379072.pdfIn PDF document text
    • http://lamardaegu.com/upfile/user/file/69910186978.pdfIn PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/leriwudigexibafekedexovet.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/55518527209.pdfIn PDF document text
    • https://vinasimex.com/uploads/file/boboganovonekaxebuf.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/wepixuzu.pdfIn PDF document text
    • https://edex.co/userfiles/files/10951298160.pdfIn PDF document text
    • https://alicantea.centralcms.cloud/galeria/files/lubufetalupamofusu.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150b2f2ddeaf---fuwomadiwotewelex.pdfIn PDF document text
    • http://technocom.pl/editor/file/54362245646.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/17931618833.pdfIn PDF document text
    • http://the100voicesofgospel.ch/fichiers/newsletter/file/20715494718.pdfIn PDF document text
    • http://coachhouse.info/assets/file/10567364669.pdfIn PDF document text
    • http://suchanekstomatolog.pl/files/file/zebiremiwozeju.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/TSvcnjQ06Jg/uplcv?utm_term=bible+quizzes+answersPDF 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_off0000ccbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCBD 18428 bytes
SHA-256: 6b5ac2935266364840c3a76e46875bfb5a8fed697fd55bfa56cfc62ce80262ab
font_01_sfnt_off0000fc62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC62 10468 bytes
SHA-256: e19b2afd494d464c937666dfefcbaef748aa78f39f54dd4b717a7933429ea1e1
font_02_sfnt_off0001145a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1145A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.