Malicious PDF — malware analysis report

Static analysis result for SHA-256 431881f62414845c…

MALICIOUS

PDF

83.7 KB Created: 2021-08-15 01:48:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 9c36f74080d282c4381432a620d4ab79 SHA-1: 53280b1a6dc1d80262bb812ec0227ecba4d0ffce SHA-256: 431881f62414845c6f577cb70132a61a88c3562dbfbafc2a0e9249ac4509830b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, but the heuristic findings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a27fd9e61b5---96115373048.pdf In PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/effe0dd964a43e209bc8e3ebaecac0dc/gupizevilimikudazufotep.pdfIn PDF document text
    • http://cdmvt.cz/sites/default/files/juvefaxadifibakovomijeli.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/2a798f9601f71f9ad87019833f547cd8/36226805576.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/ng06vnqt1k1i31mttf9cnd70s3/19004926163.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/kejirebaroketip.pdfIn PDF document text
    • http://keifo.ru/ckfinder/userfiles/files/fuwejep.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/kuxisagibew.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/1181c375ca113b99a5217449fcb17e43/65049632091.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/3dc2f2abd659982cd696815023676464/35359178149.pdfIn PDF document text
    • https://mariapolis.es/ckfinder/userfiles/files/gitivawopakoxewokazuguj.pdfIn PDF document text
    • https://jamurgoreng.net/contents//files/35483301478.pdfIn PDF document text
    • http://sobinco.cz/ckfinder/userfiles/files/79670210334.pdfIn PDF document text
    • http://cuatudongsaigon.vn/uploads/files/nurosum.pdfIn PDF document text
    • http://bestpokeya.com/uploads/files/89021654967.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ead237017---jegegovojirevinos.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/sixidudose.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609a6b4cefffb---8556669963.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/m1mv27tbp92i2iq832oqlkel2f/16409530866.pdfIn PDF document text
    • http://sy-smile.com/upload/files/6275531012.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/juzufenujamonokapezenemis.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/kojafurorilaganamifomijux.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/ca7625c9994bac9ab839e69fbabe68a2/14355139144.pdfIn PDF document text
    • https://travelone.ae/userfiles/files/64154980210.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=biblia+de+estudio+thompson+gratis+en+espa%C3%B1ol+descargarPDF 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_off0000dae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE7 11460 bytes
SHA-256: 3dcc1be5021cdd178131471d385db9fc40a016b1326b3fb85608b63bbb873a50
font_01_sfnt_off0000f51a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51A 18452 bytes
SHA-256: 799818e65f33ff983d71bbb0710bf2ef65bf8494f90178db93a55321752ed12e
font_02_sfnt_off000124d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1