Malicious PDF — malware analysis report

Static analysis result for SHA-256 d496110ccc726460…

MALICIOUS

PDF

71.1 KB Created: 2021-09-07 22:46:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 27e1de3de8f93ef042c787138e513bbf SHA-1: f084e6ca7aa353064d4bf65fa556c1d519ee3765 SHA-256: d496110ccc726460a1efdbd234ef6a0d14657014742e048f4b7ba8810c985648
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 directories and disposable hosting domains. This behavior is characteristic of a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/151aa98792b373041a1310e8eeb0329a/delisa.pdf In PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/dofemisegugumulu.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccc6bf3a02---fowemaliluvavupotinuper.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/tenapikixafozopaxiteto.pdfIn PDF document text
    • http://tuanayapim.com/rsm/files/xapafitadikumiguze.pdfIn PDF document text
    • http://fittbike.hu/files/file/wozibofuteva.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070aeca489d3---sadikuzabetomemug.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/161208cafaff17---8299699325.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160bbdc1b78067---32190801040.pdfIn PDF document text
    • http://indianspringhomes.net/userfiles/files/nufogasamemeferer.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/kemexuzun.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/66ab35d52ac30fde116ba2b1b3769b1d/1048433233.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/3089c95af021c66591d7b1c1226973eb/86402081639.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/molibedebewewoxibisuka.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607efbbddeced---bizamevex.pdfIn PDF document text
    • https://guijek.com/userfiles/file/gujatezumet.pdfIn PDF document text
    • http://sbsinternationalschool.org/sbsisnew/userfiles/file/68300958679.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/2cf7a3ade81baef3487276ddc83fa52f/vaxivivaxewuxa.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/pemenanowaterew.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/75274302805.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2be5954f8---kosemuvejotabejewonipida.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=modal+verbs+exercises+pdf+2+esoPDF 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_off0000b12e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB12E 16800 bytes
SHA-256: 06decf188b7e3b629bed96713e6b5315909494b2783a1e669cbcd2d096ecfc72
font_01_sfnt_off0000dc69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f480.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF480 10832 bytes
SHA-256: ff29058ac2c55985cb567db59f82dc6aeac83b5e71234ab10af8ece914aaca8a

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