Malicious PDF — malware analysis report

Static analysis result for SHA-256 748dc9fdb324181b…

MALICIOUS

PDF

81.9 KB Created: 2021-09-18 01:15:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 069a8a358838cb7ddab92ae1247ec41f SHA-1: 976e6dac742f03988465fc434bbd05caf33d914f SHA-256: 748dc9fdb324181bed92e069fb898c4496c7fc409c72268bcd6d658e12a34917
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to websites that appear to be compromised CMS uploads. The ML classifier and ClamAV strongly indicate maliciousness, consistent with a phishing or link-farming scheme designed to redirect users to potentially harmful sites. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/031o1k1tq28p4rm1iug47r1b9s/47456931271.pdf In PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/k3c7dapaltjpc5gmudj7s66iqc/2092131961.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///75318256251.pdfIn PDF document text
    • http://pamatudarbai.lt/ckfinder/userfiles/files/86054763879.pdfIn PDF document text
    • http://american-security-inc.com/assets/ckfinder/userfiles/files/23487123359.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/6a073a294b9c4bf5f6ee1e9df6387115/pudubok.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/96460739394.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/lasilimufibirusem.pdfIn PDF document text
    • http://imapbook.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/57225869706.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/385d1ae3f0de45d745903516c1f069b8/67675012756.pdfIn PDF document text
    • http://hzxf.com/images/upload/File/nital.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/161368cb922ddc---30726036392.pdfIn PDF document text
    • http://foodchemsino.com/d/files/gemugiforofanigofudesigut.pdfIn PDF document text
    • http://buffagiuseppeinfissi.com/userfiles/files/62480252068.pdfIn PDF document text
    • http://lepetitjaunais.com/userfiles/file/63785013009.pdfIn PDF document text
    • http://www.singchai.co.th/ckfinder/userfiles/files/88718381911.pdfIn PDF document text
    • http://uniquecharacters.com/upload/files/26310576711.pdfIn PDF document text
    • https://pharmawell.eu/ckfinder/userfiles/files/43815001646.pdfIn PDF document text
    • http://csc0351.com/userfiles/file/20210914175803_f9rvd6.pdfIn PDF document text
    • http://adice-area.com/pictures/files/50379422856.pdfIn PDF document text
    • http://shoreluxurylimos.com/userfiles/files/mususamojimenodam.pdfIn PDF document text
    • http://wirtrauenuns.ch/images/file/fabegufibolun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=word+puzzles+androidPDF 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_off0000dc68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f47f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47F 10440 bytes
SHA-256: 182887082dfcc04190b5b94d533c8bc08a42f6e9ff12d3ededd622bbe2d2a29c
font_02_sfnt_off00010c42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C42 17784 bytes
SHA-256: 56a2c2f8ed2b65b214576c1b4d84f533b9c7377a6cac22b06afe1ad0f2ea690c