Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bdef0c770a52a81…

MALICIOUS

PDF

81.9 KB Created: 2021-09-01 06:51:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0b1804462d092b7c09fb376123cf9eac SHA-1: a3b2465d1697c79f53f3d1aa898eab9af731112b SHA-256: 5bdef0c770a52a81d49cc46e102c253287bd2769e16482f5d6512b05a4def253
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure suggests a lure to trick users into visiting potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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://pepinieramontana.ro/ckfinder/userfiles/files/9033172853.pdf In PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a499ea9e3e2---14113353899.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7ea115ada---40160227720.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/75147092675.pdfIn PDF document text
    • https://noriupapildu.lt/ckfinder/userfiles/files/62371480648.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa3a3a7502---86394222283.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/2766585599.pdfIn PDF document text
    • https://cityface.cz/res/file/vaxusijesasesoso.pdfIn PDF document text
    • http://wjcopy.com/upload/files/dufuximepoxik.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/manutumide.pdfIn PDF document text
    • https://adtw1.com/ckfinder/userfiles/files/13333400588.pdfIn PDF document text
    • https://pepsima.biz/files/file/84342558734.pdfIn PDF document text
    • https://lionkingbali.com/uploads/file/70125035313.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/0p45e9t4vsha9a7hboulgnnald/sojigetofixiti.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b45788dcae---somenaros.pdfIn PDF document text
    • https://karpzbeldowa.pl/uploads/userfiles/files/jetexibewekagokekisir.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/tibifo.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607d211c4ccc0---jonurifu.pdfIn PDF document text
    • http://tuyothuyluc.vn/webroot/img/files/44751990317.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/jufetalafefutozefuv.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210725_478916C0560D8D14.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/86543e86f4592dbc86acfb8411ef86e5/901842959.pdfIn PDF document text
    • https://majubesar.info/contents//files/42460482683.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=what+is+the+biggest+fashion+show+in+the+worldPDF 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_off0000db9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AF 17708 bytes
SHA-256: fd397f97cd5f71d5dcc3890263c95cdc26f3e79c6b5e84481db1dc49442282d8
font_02_sfnt_off000120e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120E1 10852 bytes
SHA-256: eeaa7b87bbe4e3a66947892331b9c288ed57d7c29305bd21232aa127bf1fcf16