Malicious PDF — malware analysis report

Static analysis result for SHA-256 4740eae044ee2f02…

MALICIOUS

PDF

74.2 KB Created: 2021-09-02 14:31:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a0e072ed5dd457bd8d0445ceb49dc9af SHA-1: 909fe91c4050f57e2bfc76f74e30b71f2aa56aab SHA-256: 4740eae044ee2f0255cf748f40db71ded9ffe5c6b92759d3762ad19995813c34
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to numerous compromised WordPress upload directories, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs are likely part of a campaign to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16098896ecc267---zigawuwolubo.pdf In PDF document text
    • http://sun-green.nl/ckfinder/userfiles/files/jawogaguvizejegolodi.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/16084d32e88643---5059260603.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/9a53ee9dd2dbb27e08cb510316f93246/26058707548.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/8eucsbn9rsquhjv5v7q2elt401/2667121405.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/74702910319.pdfIn PDF document text
    • https://hchoanglong.vn/userfiles/file/69630054970.pdfIn PDF document text
    • http://www.fd.ntou.edu.tw/ckfinder/userfiles/files/tefamapaveveruk.pdfIn PDF document text
    • http://proxkimya.com/resimler/files/93008824026.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079bc8a4042f---tunemademiwabotitan.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/sfgom157srrh0g4a137fhvt620/90971631427.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/e600972694ce5742a44223cb9ce2b2dd/sadomatejadanet.pdfIn PDF document text
    • https://t2sc.me/userfiles/30106815066.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/3i25cogv4s53gfsaegm2q23s7t/runofibamibufu.pdfIn PDF document text
    • http://bscartridge.com/pic/99400405036.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607a59143bc51---xubizuxuvaxodewewi.pdfIn PDF document text
    • https://manajrgvaaradhi.com/cms-uploads/files/6561633117.pdfIn PDF document text
    • https://kingyao.com/uploadfiles/files/20210726_072925_9893.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/86992885918.pdfIn PDF document text
    • http://bienbao.org/uploads/files/34120158687.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/85916369471.pdfIn PDF document text
    • http://wx-test.com/upload/ckimg/files/202108210622494152.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/70600645288.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0cf3192a7---51447157820.pdfIn PDF document text
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sijaxoti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=adding+and+subtracting+fractions+worksheet+word+problemsPDF 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_off0000bd47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD47 16552 bytes
SHA-256: b023247ed36aabbb756ef938a55fb197f14adad201b57cf0561dca8c36ea2b25
font_01_sfnt_off0000e7df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF6 11464 bytes
SHA-256: 3649f90a0b4d14be893bc292f2871ab9564d8a0bb5dc36fa2f02c3d1ce335fd5