Malicious PDF — malware analysis report

Static analysis result for SHA-256 98075ca9664ff078…

MALICIOUS

PDF

78.4 KB Created: 2021-07-26 23:24:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2bd608f1b6582132817d809ed5f6a2af SHA-1: c366a696d034a18fe454d3e390f2042e69c64aea SHA-256: 98075ca9664ff078196e6449131ed6fd0ec7d16b75b19dcfb407d9137f5223e1
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to compromised WordPress upload storage and other disposable hosting sites, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure and embedded URLs strongly suggest an attempt to exploit users via malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://tekmaker.com/upload/files/1327726194.pdf In PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/480f692419a6c7877eb6fa59b94acb7d/bavifafibilimofilal.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080c906b2e63---kijamulo.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/s7ql91c09rf7kl109tm3adbckh/57991325049.pdfIn PDF document text
    • http://darstin.com/userfiles/files/fuxofojowepip.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/f6d3a6360c2b137daefcfd0984fb527d/dixuwesozuzagisa.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/62320713951.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/842311a7bc53605aea077042d6495c59/lozafevamonaxosanifu.pdfIn PDF document text
    • http://sam-global.ch/files/file/96716652091.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/11bd24a49a00ca9c95e6a0f2c68eaf40/86717191975.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ca01c440e---80019309058.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/ba8511b47cb669a18b450589f44e3b8b/88487465190.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/jd68unb5o8ini3k05aj9unfkdg/7700574060.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/49056491501.pdfIn PDF document text
    • http://krzysztofmalec.pl/gfx/fck/file/vividavujopazo.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f159a2dda---34166310952.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/39682951242.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/baa3648c951d44921c2ddf30f9954370/11324170023.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bf767c25899---51076326758.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/jiwowotovapimixezajorivi.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce2ef21772---balukupon.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/e81542h335oo8gl4tvf786vnjo/63934024041.pdfIn PDF document text
    • http://pensacolahigh1964.com/clients/1/1d/1d652d7f5bd5fd2f3712913460b20393/File/96866871542.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/bokakomememelelobiluwik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=dhruva+natchathiram+tamil+movie+mp3+songs+free+download+masstamilanPDF 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_off0000caa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA0 11492 bytes
SHA-256: 50d73ccfd448d1d37bdc9dadc9735c3a81687924353262932f7e3223ad7c05ca
font_01_sfnt_off0000e582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE582 17504 bytes
SHA-256: 22c69086b6917ec13121a5f4a6be152545b26136c160d8ffdb47ff6df8c55295
font_02_sfnt_off00011236.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11236 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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