Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ac509eeb1051eeb…

MALICIOUS

PDF

81.5 KB Created: 2021-09-17 12:37:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 119676e53be2e6211f0b356f3068b083 SHA-1: 67fa6f0034bdefb509e614d8722b2af7061b7fd1 SHA-256: 2ac509eeb1051eeb49e2978ddbcff88e24f0e45e3087b3b2deaf0d5e03ee37d6
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to disposable hosting or compromised CMS upload directories, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and URL analysis point to a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 http://wecans.net/_UploadFile/Images/file/64202845438.pdf
    • http://ichieh.tw/uploads/files/202109011412208352.pdf
    • https://cremyco.com/app/webroot/docs/file/kowamap.pdf
    • http://mimarkamilozkartal.com/userfiles/files/dilifamaf.pdf
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c70ee549c---2177251873.pdf
    • http://trumoi-khutrung.com/upload/files/51125363835.pdf
    • http://mp-journal.com/media/file/26293100396.pdf
    • http://caythuocdangian.net/images/files/77320368962.pdf
    • https://araprinter.com/ckfinder/userfiles/files/17273376832.pdf
    • https://birutelorasin.com/contents/files/rowukedifekumesinuwebi.pdf
    • http://nakamurasangyou.jp/app/webroot/uploads/files/45239811176.pdf
    • http://ccsilver.kr/files/fckeditor/file/15204158636133251810e36.pdf
    • http://kemenyseprosiklos.hu/upload/file/50280497037.pdf
    • https://doosradashak.in/ci/userfiles/files/rujutusumevibaj.pdf
    • https://intekcanada.com/ckfinder/userfiles/files/sinekusixatef.pdf
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/8ede08a0aad08d1183f68f4605283d82/jatakiw.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1d98a1360---nidobusevat.pdf
    • http://falconfam.com/ckfinder/userfiles/files/77686889547.pdf
    • http://adria-ex.com/images/blog/file/dixabikofigezafizafi.pdf
    • http://liburnia.pl/userfiles/file/bajanegodek.pdf
    • http://mlight.cz/archiv/file/78887107209.pdf
    • http://matchonusa.com/uploads/files/xisizisevaxarud.pdf
    • https://armenia4d.com/contents/files/jabojisare.pdf
    • http://domgr11.ru/uploads/files/vuviveralefixegobitiduxub.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=android+shooting+games+with+controller+support
    • 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_off0000da67.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA67 16792 bytes
font_01_sfnt_off0000f279.bin
c62c43700513776866914bcfe48f495df1720c19705ed6e1c2f2ed5a033b89d3
pdf-font-stream PDF embedded font (sfnt) at offset 0xF279 17088 bytes
font_02_sfnt_off00011ecb.bin
c9e47c79cd1d36ad5ca42cd0ca7f985ba195c146eda9e53f41c377d4c62c15c7
pdf-font-stream PDF embedded font (sfnt) at offset 0x11ECB 11128 bytes