Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c02e6b9dedb389e…

MALICIOUS

PDF

81.5 KB Created: 2021-09-18 23:45:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1ee1e925af5518f0b579d32fd552af0b SHA-1: 2d42bf6f56f172e5b3d25b7acb4adaebb0ddd098 SHA-256: 3c02e6b9dedb389e296e0ecd6604c3db289dfef7e29ca51f5ce174c62dd1439d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to various domains, some of which are associated with compromised CMS uploads. The primary purpose appears to be directing users to external content, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • 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://discovercefalu.com/_data/images/file/16867079703.pdf In PDF document text
    • http://erimti.com/userfiles/file/solofidivokofaxa.pdfIn PDF document text
    • https://ceramicasvillaflor.cl/UserFiles/File/42200375668.pdfIn PDF document text
    • https://galaxytraining.examinationonline.com/files/sawuse.pdfIn PDF document text
    • http://noithatsah.com/webroot/img/files/41206469187.pdfIn PDF document text
    • http://vladekoservis.ru/files/15335727741.pdfIn PDF document text
    • http://eakqshop.com/ckfinder/images_store/files/daxowoxavekurizokize.pdfIn PDF document text
    • http://srs-budapest.hu/uploads/files/24537992502.pdfIn PDF document text
    • http://www.sudaff.com/pics/file/moromepuxikazoz.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee74ee55ce---81243339995.pdfIn PDF document text
    • https://ducthai.vn/userfiles/file/55413753824.pdfIn PDF document text
    • http://tv-kitchen.ru/files/files/budujawoz.pdfIn PDF document text
    • http://mrs-edu.com/sribati/editor/uploadfiles/tirusewek.pdfIn PDF document text
    • https://kompaspt2.com/contents/files/gokogozurusakupata.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/9b79d5b7cafd2a1b48c0930f1c49b84c/51077820972.pdfIn PDF document text
    • http://christ-china.com/filespath/files/20210913150233.pdfIn PDF document text
    • http://opuspointpartners.com/ckfinder/userfiles/files/33208654868.pdfIn PDF document text
    • http://dennehylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/40707699913.pdfIn PDF document text
    • https://matrixx.lu/images/nokemivaxosatafeka.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3fb7ab5af---dasivisokizogoxijex.pdfIn PDF document text
    • https://hahapediatric.com/uploads/files/202109161754409834.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/jixigevajebiwexasalopo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=brawlhalla+mod+apk+unlimited+moneyPDF 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_off0000da11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF223 17244 bytes
SHA-256: 4deea72924f575051e339e84d8f708f9b4bfb42ed887a344d4a2e66f02eeba97
font_02_sfnt_off00011f1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F1B 10932 bytes
SHA-256: 18e71dbfe7c140bd1dc66a7892a2a9d44d22dda622060d2de768418e358f7fc5