Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa7ca5488bcef9ec…

MALICIOUS

PDF

85.1 KB Created: 2021-09-07 21:55:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7457ba2769a17ab87547e8486299abdc SHA-1: 1a9b7c88f42092e1785b657774e2aec11e8fb259 SHA-256: fa7ca5488bcef9ec9514fde3a8f0888b3131e88abda00d1035f1b5ae0895cdc0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristic analysis revealed that the PDF contains a link farm pointing to multiple distinct hosts, many of which are associated with compromised CMS uploads or disposable hosting. This suggests the document's primary purpose is to redirect users to potentially harmful websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://thessalonikiflights.com/files/files/55631486424.pdf In PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160790bc864a71---peranuvijowoviluxat.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e2dc02190---61109048834.pdfIn PDF document text
    • http://katour.ru/admin/ckfinder/userfiles/files/23625350534.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/f4rl73f7svmihps32oj2qkv4c1/89943575088.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/0vu49ikfi1qao3bi084fofp8am/delokubobakaxu.pdfIn PDF document text
    • http://kco.su/userfiles/file/3676808244.pdfIn PDF document text
    • https://ambalatender.com/upload/files/tewopowo.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe03b21855---vebabenufutogegife.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa45d9f90b---jomosukafevekevelofi.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/12454010961.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/c46f5e6e0f5c68978f1005958fd2807d/baguzibememo.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/d05ba7e5deaabdb4ce152b6423a7e6ad/fopejokakitumaw.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160812a444905d---74405133233.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1608eef6412c9e---pudotosijudoz.pdfIn PDF document text
    • http://3sdent.com/upload/files/xomatajadasuninilarom.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/8qj2rokoskpbq27h1gl5rs8vd4/88429688548.pdfIn PDF document text
    • https://jpjplumbingandheating.com/FCKeditor/file/ralobuparebijenebujeme.pdfIn PDF document text
    • http://bigredclassof1960.com/clients/879476/File/wupadimixix.pdfIn PDF document text
    • http://findplusltd.com/file/tidugivolozojamotufugam.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/8f5joeedbfjvcu0nfaugi6vp2q/bepadugusuwudosar.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/jugedidokijezoludozotil.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd420ac377---28848597003.pdfIn PDF document text
    • http://www.moyekolodin.com/files/rutavu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=usmle+world+notes+pdfPDF 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_off0000e5f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F3 10496 bytes
SHA-256: d2c46c71b41de038686da1685bd5643b40929abeb4a633093a56da63d03c292b
font_01_sfnt_off0000fdd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD3 18392 bytes
SHA-256: 131957bf965c3d9d1d50342cf702606d406110cccacafb0628219c34f07571cf
font_02_sfnt_off00012d2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1