Malicious PDF — malware analysis report

Static analysis result for SHA-256 e957e522f29e23bb…

MALICIOUS

PDF

83.0 KB Created: 2021-08-11 01:50:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: fdf8ce8b15fb023ad1c30ef0530ba849 SHA-1: bc14513c8583ab8a27fc11cd29320015383ca489 SHA-256: e957e522f29e23bb7ad3c6ef21990f1f65014a9dc30f77ae34b6d10d12226cde
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://alkanboya.com/files/file///3303567525.pdf In PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bbc17617da---kulupexuluridodod.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c92e6582f6---24336662465.pdfIn PDF document text
    • http://www.polni.si/Images/files/zonen.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/78040733251.pdfIn PDF document text
    • http://location-venise.com/italie_documents/files/28462614286.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b82cd8e25---kubevigixudapewu.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7aeb1251e9---97294208252.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/pl3trqtgocve4f7022vvle6oua/mizirogit.pdfIn PDF document text
    • http://princeverma.in/uploads/files/nijolopinob.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/dsgqbnf4dg28bq7srpckn7j8i0/jiwepubixinogibaxi.pdfIn PDF document text
    • http://pure-chiral.com/upload/files/gefaxamado.pdfIn PDF document text
    • http://azs-szermierka.pl/zdjecia/fck/file/rowimugewiwipuwajuzipa.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b8a6d0e56---75636264585.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ac278210e7d---luvejofujazowava.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/zuvulepuvufi.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/27tnmv8opjr5d4pv92qklhjd25/rumoduvutavapuganusosuj.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e4d31af7e5---65906979619.pdfIn PDF document text
    • https://pestresolution.pt/site/upload/file/wolarefaza.pdfIn PDF document text
    • http://www.kymenhome-etsinta.net/tiedostot/files/wijosigote.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/86489484502.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/40294944980.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=2005+harley+davidson+sportster+883+owners+manualPDF 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_off0000ddd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD1 16820 bytes
SHA-256: 5a8ef1065732f803db1beba93474deb3eb6bfc909aab57f98a9703a30f2025b2
font_01_sfnt_off000109cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109CF 11684 bytes
SHA-256: d64e4fb364c39ae2df444cb175a6d563fb73668718011d46cbfaa71280153268
font_02_sfnt_off00012594.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12594 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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