Malicious PDF — malware analysis report

Static analysis result for SHA-256 864f3aff42560200…

MALICIOUS

PDF

87.6 KB Created: 2021-08-26 15:04:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0bd721549e87e9e56e3bf2dcaf07b93a SHA-1: 0e4eb126daeb87449ed23e3e5d455bd420268927 SHA-256: 864f3aff42560200c03972e1b003e41c07f489313a7a32937a695a00f4914529
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress upload directories and other potentially disposable hosting, suggesting a link farm designed to redirect users. The PDF's structure and embedded links indicate an attempt to lead users to malicious sites, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1609349c11e627---gilivis.pdf In PDF document text
    • https://deitratech.com/userfiles/file/rigijelesilegutixipite.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/46745660637.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/18371735147.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160886d1d184d8---labufonifozibupafarejow.pdfIn PDF document text
    • http://epplast.com/files/file/nijajenum.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afbb7c52716---furenokifevuzisawipevipev.pdfIn PDF document text
    • http://smit-electronic.hr/upload/datoteke/61147171051.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/27e70cb7e7b8febd869bfce9cafe7fe5/16751431676.pdfIn PDF document text
    • http://zonwering-nederland.nl/ckfinder/userfiles/files/42859830776.pdfIn PDF document text
    • http://fontanarosaserigrafia.it/userfiles/file/divanefepuwomew.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/xujutupim.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/5dp7urnatufkoa7eaea9mc8f93/pulisixatamagezamejeb.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/651db2d3d5ef252dd0d1b5b6806f2edf/gegiresajufim.pdfIn PDF document text
    • https://98ing.com/upload/ck/files/20210624_210500.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/203532dfa9a22917ee75981d8c3fd208/bujutidovaveboji.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/13794986295.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/33663827588.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/9e679c9736d0d2a0ba429c4e7f993eeb/jegelujabumivogogul.pdfIn PDF document text
    • https://peterdegendt.be/file/lulozekikawu.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/duvosafowesanod.pdfIn PDF document text
    • http://inezorviskids.com/clients/37546/File/tunurojotexipurubuloxili.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/popobo.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/1kgp8228gv6r5r507b5vdeq850/65408943906.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=national+commission+on+health+education+credentialingPDF 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_off0000f02b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF02B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001083d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1083D 17744 bytes
SHA-256: 4038d61b7cc5077c2e59a0f242dc39c0fa8d38cc0587fdbcde4eaf3dd9cd7112
font_02_sfnt_off00013753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13753 10896 bytes
SHA-256: a047d404890dec03f26193094cfe6b5df857baa592db2adc619225c66f5a7309