Malicious PDF — malware analysis report

Static analysis result for SHA-256 be8fc096cac6e6e9…

MALICIOUS

PDF

105.1 KB Created: 2021-09-02 06:14:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5e859af2d177ab48c715d63954b276a7 SHA-1: ed8ff59619202c0df2710c7922a176ef02fac481 SHA-256: be8fc096cac6e6e9079c4b7e6821b26c251bbcb2f7e4c6c8e2f1703e8f8fc9fd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or redirecting to malware. The presence of embedded JavaScript (T1059.007) suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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 https://sssmri.com/ckfinder/userfiles/files/vusivuxolaminisinadudeju.pdf In PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/804d01bfd15212ecb4c61f21774c8103/difavupatanazepibom.pdfIn PDF document text
    • https://bachson.net/upload/file/towokivuromat.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/69456534727.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091aaf407b74---mukesonozuvomefurad.pdfIn PDF document text
    • http://dhf-china.com/d/files/73971540509.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/fodok.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/sogur.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe785c5849---67316843741.pdfIn PDF document text
    • https://businesslife.com/content/file/9942027331.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/jc9d205i71qmd9ocgf3tp2vdu6/vawiwurixerosigajesovaj.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160ae171b0797f---wiwixofekibutoveriwe.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/6eae0b842e0c88c46c3a0756ff57bd19/19305295014.pdfIn PDF document text
    • https://www.allduniv.ac.in/ckfinder/userfiles/files/53263887306.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/vamalukodiradifujelusisaz.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/felepe.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/161035a0905bf5---22996927783.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1612ca8a27c3b9---49553105223.pdfIn PDF document text
    • https://babamore.com/upload/ckfinder_temp/files/20210611235951.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/d424e30cbd2d56e2ba7d83e10781de12/11626147716.pdfIn PDF document text
    • http://mmbassisiprovince.in/files/js/ckfinder/userfiles/files/76072298529.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/7c9d4013921ca9468be724a1237dba87/gabelizuvedetisobererofux.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/68014581565.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a484d7abb79---kitukoxebedesekok.pdfIn PDF document text
    • http://didongsinhvien.com/upload/files/diwaderigimusu.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160856be96b37d---41228417791.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=famous+gay+peoplePDF 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_off00012e4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E4C 10392 bytes
SHA-256: 518791bea585cbb384de4ca82917eb37352849a9d4feb56394b0f01191cc2d88
font_01_sfnt_off000145e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145E0 21240 bytes
SHA-256: 73acab8fe6133d45567c933ffe7877ddcae7387819e2afa6a77c4241b1352333
font_02_sfnt_off00017e1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17E1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1