Malicious PDF — malware analysis report

Static analysis result for SHA-256 355516c95f8b0e01…

MALICIOUS

PDF

81.8 KB Created: 2021-08-18 22:29:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: bdd38277db2d259d0821fc050e288b12 SHA-1: cd2cf32fcba20a44a871346c5794ef6df6141744 SHA-256: 355516c95f8b0e010a5663f78e6a874c8076364f989d1aec006a02caa810181a
104 Risk Score

Malware Insights

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

The ML classifier strongly indicates maliciousness, supported by heuristics identifying the PDF as a link farm pointing to compromised WordPress uploads and disposable hosting. The presence of a 'download button' lure further suggests an attempt to trick the user into downloading a malicious payload. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ncvpte.in/userfiles/file/raxog.pdf In PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/e2d7313f914d6d70fa1ac2c57921e86b/devikifotenusovomitusita.pdfIn PDF document text
    • http://dejede.com/userfiles/file/fetuwanomasejaf.pdfIn PDF document text
    • https://kompaspt2.com/contents//files/konofilaketixija.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2aabc86220---50324417822.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/8c8b0038e2961c7f11278cea8fbcdc92/42787115677.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/53f91c1bdc2f3d5677dd921a989ddd86/63319327355.pdfIn PDF document text
    • http://uralinteh.com/uploads/files/93554469423.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/ac819b18935e8ea4d78147895eef6a01/83438587421.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/061707357466.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/8285006060b92c5ea23d3.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/ivni7psvodklbgdrtd89bbsidq/39990333867.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/93527110088.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/05/24/file/20210524_091235_115.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/068a3de5f1846502d08f4c3d90e0c1af/85708930718.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/52ef75fa8866c97316b046033e525119/43103493878.pdfIn PDF document text
    • https://sbsoftware.ro/admin/userfiles/file/35961874123.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/95388330797.pdfIn PDF document text
    • http://thanhlapcongtykiengiang.com/upload/ck/files/34606532814.pdfIn PDF document text
    • http://debsecond.net/UserFiles/File/69877043909.pdfIn PDF document text
    • https://kawanmto.com/contents//files/76056254140.pdfIn PDF document text
    • http://www.colormotion.cz/UserFiles/file/57639714314.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/204983907.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/4edd71c2ac1db87b4c72edd7a9430708/nujani.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=important+topics+of+biology+class+12+isc+2019PDF 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_off0000daac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAC 16912 bytes
SHA-256: 48ecddfa22254c4ccda7a3fc272263ac282c8a3ff6d257facc94db2ca5d4538a
font_01_sfnt_off000106b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B3 11360 bytes
SHA-256: 398c4d072536ffcd2fa0dec052a1de53c082d85d59e2e8d5542ef328e6e8ef97
font_02_sfnt_off0001214e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1214E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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