Malicious PDF — malware analysis report

Static analysis result for SHA-256 68d670e6a1cc279e…

MALICIOUS

PDF

89.5 KB Created: 2021-06-27 15:47:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c542ea252eba2728b559a02349a9d327 SHA-1: fa9bc7e1da3a4b44674bbe47801a6c02e329fa11 SHA-256: 68d670e6a1cc279e357a3bdb5cd84df9be637018b93343f82ef1503920a86faf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of 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 distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • 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://dichvuhieuchuan.com/upload/files/90212782443.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16072b2b983b10---90027968481.pdf
    • http://joy05.com/_UploadFile/Images/file/59535471778.pdf
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160737ef2cdb88---wapalurutemuzimajulew.pdf
    • http://ahlhy.com/uploads/file/011415433441.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ccdf05995f---muzerukitu.pdf
    • http://www.aluvascientific.com/UserFiles/file/regomurefazubalepa.pdf
    • http://megat.pl/uploaded/fck_files/file/98425756928.pdf
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/1aada925160b5b0d3bb9ef0e00fa8742/27513516864.pdf
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/465eed552b5eb95e336365c2838d3043/62095999541.pdf
    • https://www.cittadelmiele.it/wp-content/plugins/super-forms/uploads/php/files/027363cc9d9eab34c0e797e20763d9a5/44617483236.pdf
    • http://chromatographvials.com/d/files/73725125482.pdf
    • https://bczenekar.hu/files/file/kabow.pdf
    • http://paintmaster.hu/js/ckfinder/userfiles/files/kirexudupinenubusob.pdf
    • http://xn--12cmi2byac9cdhd0hra6d7bxkwbgj1gch.com/user_img/files/6344111554.pdf
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/pu44rrbnsiigrtu1mfvqk08fs1/gimiwepigusekuje.pdf
    • https://cgeminfos.ma/upload/file/75308942593.pdf
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/997ee5309d3a30f1ad57fcaa3c0c24c0/bepebutujopuxij.pdf
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/138f8a3839383e89c7bddb4bdcff86d9/86634571351.pdf
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/3dc2f2abd659982cd696815023676464/35359178149.pdf
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/qm5lh178d7ra7f5j3dg6u1f7d1/disajobamarakoler.pdf
    • http://arohitourandtravels.com/userfiles/file/xenof.pdf
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087fe848881e---padapajak.pdf
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/c7a8391c97df367f8c09032727d8c62e/kiwezagiziroxi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=law+and+order+release+cast
    • 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_off0000fc10.bin
412ce8652cbbc90afab4b0e4f92f2008d14fc25fa1cba09bbc5e9b857ace9bec
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC10 10316 bytes
font_01_sfnt_off00011383.bin
df07badde5d9a3aea043976b7e9c6e432b466b6693de04bcf1cfe853764afeaa
pdf-font-stream PDF embedded font (sfnt) at offset 0x11383 17480 bytes
font_02_sfnt_off000140b7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x140B7 16792 bytes