Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5d43f16b0520655…

MALICIOUS

PDF

87.0 KB Created: 2021-07-15 22:37:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 153ebb17d1d9086fcfd783b8518d0b6b SHA-1: 475bbb4dbd2251e3d58835d319804c6e24754136 SHA-256: d5d43f16b05206551aa9bc576f42a12a96b60230d463f26d4f394806d0f60750
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to multiple compromised WordPress sites and disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the presence of numerous URLs and the PDF structure itself are indicative of a phishing lure designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://ttccid.com/userfiles/file/42315733400.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089721ea681a---dokoneko.pdf
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/8a873100fa04de7b0af56d38fdab7197/46293767479.pdf
    • https://namratalakhotia.com/userfiles/files/93982710588.pdf
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bc17ade4122---pikotuvipanukarifojem.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609130f1e0384---58771104284.pdf
    • http://jucal.es/images/file/56438971734.pdf
    • http://klefmarken.se/upload/file/zotuximamafuxesulupudo.pdf
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e5bf5c208---sirotiluvimexezosekuwebot.pdf
    • http://aite-materials.com/upfiles/file/48429655915.pdf
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608efc7e85ab0---wuwikewesisovaduki.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160bb786ed4bd1---madijazazonod.pdf
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b4bfc99e32a---92852336240.pdf
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/3061760062.pdf
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/73bcc0985425ba5d8a20a711e18e15c0/jogatepeboxosuvanukusa.pdf
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160745a9e3ffef---4331984332.pdf
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/1dc56fabd6e93a1d71d21759a4ba3622/3074763186.pdf
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c781f1510a---sigopoluta.pdf
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9eb1bf484---75176017485.pdf
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8f208544a---xefepoxeka.pdf
    • http://stepsforstarlight.com/clients/c/c6/c668404594a1c08d975ab50c7bec58f6/File/21026015844.pdf
    • http://decom.pro/admin/ckfinder/userfiles/files/mogebepajovimanutuxazoti.pdf
    • http://ideviceplus.be/app/webroot/files/userfiles/files/78868342447.pdf
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/r721osko3as3e1gdpd374u90v7/44018378458.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/9f33537e7233f4fdcaabb17c3c698e35/sofon.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=how+to+insert+watermark+in+powerpoint+2016
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef6b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6B 16792 bytes
font_01_sfnt_off0001077d.bin
770f8a77243924fd646dad0043242f7bfb22bacdc1299812baa57eb8b6ee84c2
pdf-font-stream PDF embedded font (sfnt) at offset 0x1077D 17248 bytes
font_02_sfnt_off000134d3.bin
2b06c8891049caab84dacb708eaa26097b32baea350efc5fbd7be18d221bc40f
pdf-font-stream PDF embedded font (sfnt) at offset 0x134D3 10996 bytes