Malicious PDF — malware analysis report

Static analysis result for SHA-256 783b64da21daf5f3…

MALICIOUS

PDF

86.6 KB Created: 2021-09-05 23:29:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 680296f45fdbcc06e51fac49f945757a SHA-1: 36b0a6496aaae2100681f83b97426819a98a373e SHA-256: 783b64da21daf5f392bc42294ffaf2f9083cef4dc221154bade8b5baa2b707d8
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users to malicious content or phishing sites. The presence of multiple external URIs and link farm heuristics strongly supports a phishing or redirection attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://smidgel.ru/uplcv?utm_term=autoestima+baja+definicion+pdf PDF link annotation
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/70c5b9d3104da77df6032c9aa218a1ff/vupudikazurojede.pdfIn PDF document text
    • http://abwsalisbury.com/uploads/files/vedetukisirefuzevetalimiz.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c112c53821a---medageniwepiwetudijofoni.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a13372205ef---46057156079.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/59651830665.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7c98c1dc3---munujivejubadaxomo.pdfIn PDF document text
    • http://hanstime.com/userData/board/file/wiwoxatebe.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/20b2cbcaa697e687cccf02c9d5adae35/62557628544.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/28871571555.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a1386d890e0---pasezazadimisufema.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c15ce7e263---rivilesuzafavuz.pdfIn PDF document text
    • http://446888.top/userfiles/file/maxabufuzavigovipewetene.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/2afc507bfa0a515eb7061fd4c81ece09/xifim.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/vewedizatijit.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/80913366303.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160856d6e357bd---faxawaxilasumigax.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccd68843275---tavejimif.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/bubonuteluz.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/98367297923.pdfIn PDF document text
    • http://chinamakina.com/userfiles/file/pipifozifubise.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/merowavezezejifujalaron.pdfIn PDF document text
    • https://morganmethod.com/ci/userfiles/files/12885512814.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bcf81ca24ec---rujasedurivosuso.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/4553a98cf04b4cc2282672c2f9aa40f6/gujifesixavapepevudub.pdfIn PDF document text
    • 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_off0000ebe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F6 18100 bytes
SHA-256: 6f7a64ba99a7a119e97c4f1860b7ca839b979fccbb5b2322d82d7cc816f7b032
font_02_sfnt_off00013177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13177 10988 bytes
SHA-256: 519747173dd69d2db4f48fc1df9d4fd2adad065dd2b8d98819e06d89e485a6b8

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