Malicious PDF — malware analysis report

Static analysis result for SHA-256 b49460dd2c4c7263…

MALICIOUS

PDF

80.5 KB Created: 2021-07-23 19:10:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: dbd5709ab33e9d5baf4fc4f26f7ffcc2 SHA-1: a60c37d2762d26d1b75cb96e2b28e4ddb6041400 SHA-256: b49460dd2c4c7263132d6b8284d2756a7c50a431c2ec92f1d4a731b92bf685a1
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains a link farm pointing to compromised WordPress upload directories, likely serving as a lure for users searching for software like AutoCAD. The presence of external URIs and the nature of the heuristics suggest an attempt to redirect users to malicious content, potentially exploiting vulnerabilities within the PDF reader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160873d3808190---6656658986.pdf In PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7804b673d6---71996117327.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/577cef8bae8ed7c6e1e8691d5f8ac3c5/6637991773.pdfIn PDF document text
    • http://servicedental.it/userfiles/files/11111333518.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/7596856664.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/pujetozu.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/d0e6033061899cf41ef2bfe2740ea5a3/49662760655.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c779f7607ad---tawukiti.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20210629190122_ug0k7r.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/25b4ed1jl5h0406f3jbanqjtc5/fipawobojixajediz.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16071afe47297e---girarufez.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/4tg6ckv60ke84930235pbaoqn5/xuremukuvixovoxugabebida.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/db2481aff3dc56f100eba9d31a0758f0/zexudorirajejomopot.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f77315098d---jodaf.pdfIn PDF document text
    • http://hilltoplancers1975.com/clients/13753/File/23796511296.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/59570409826.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/39507647128.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/49475154248.pdfIn PDF document text
    • http://globaltruthmediagroup.com/clients/a/aa/aa8380eac451876ae6ab993bf3a720d6/File/legokalox.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/24075845124.pdfIn PDF document text
    • http://hanleyresources.com/images/40400317260.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/xaxidulinugedidawa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=autocad+2014+serial+number+free+downloadPDF 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_off0000d6c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C5 11316 bytes
SHA-256: 576747a1e8ad26c6595791b173b3018695bc46df51b709091333894cd13a1630
font_01_sfnt_off0000f18e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A0 16224 bytes
SHA-256: 53eeee54fda8ec0da6c903c41cd71786a3f0450f1752a06530f79b196d8ea891