Malicious PDF — malware analysis report

Static analysis result for SHA-256 87a614b27de3cd6f…

MALICIOUS

PDF

79.4 KB Created: 2021-09-08 08:50:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: abd6e234983830abce021c088c88b0dc SHA-1: 043bcb8a43bb15c98aa80b5bf51256ce84ea53a9 SHA-256: 87a614b27de3cd6f42a6d577ee68e553d502bccb944c15a9680593fcac4fd9ba
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and acting as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, so the analysis relies on the PDF structure and embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://batiment-tunisie.com/userfiles/file/56106347679.pdf In PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/edc6dde0c73187a0cb21c76ba82bd5c5/disujumajanezipun.pdfIn PDF document text
    • http://kvbm.org/pds/userfiles/files/wozoto.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0ec679a08---39560322408.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/9069087939.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/96698020501.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16105dec3c3941---79969731261.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/b5e4e451a12b8d4c243539e28e4ef2df/33468680162.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/memoweraxix.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c70fec06e7c---tafuseto.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca07be38237---80468732302.pdfIn PDF document text
    • http://www.gpe-el.pro/ckfinder/userfiles/files/83551165746.pdfIn PDF document text
    • https://granitabrasive.com/editor_up/52184284852.pdfIn PDF document text
    • http://ned.ru/uploads/files/39169372754.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/zumolafavagoburaxeb.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/vte699epu731s5hno6p5ge2mag/gorujatezokor.pdfIn PDF document text
    • https://xeroxexpres.cz/userfiles/file/92611002324.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/rusoboparopa.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/popasetusosujojuzul.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/teletifazida.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130922d2cd24---1082620240.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e053baa773---mapakelagapomek.pdfIn PDF document text
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b83b838f8f---pemetuzedewozoxo.pdfIn PDF document text
    • http://samtle.net/ckupload/files/lalajidon.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/16070c579ec220---54019151459.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=decimal+subtraction+worksheets+grade+4PDF 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_off0000cf4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF4D 11316 bytes
SHA-256: 3769e0fae592e3380674accde411244f34858ee762492e5ab0ff347ac0045b23
font_01_sfnt_off0000e99a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE99A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000101ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101AC 17832 bytes
SHA-256: b90c0808898083420524d4790c536388942a0fac88e8fcc942152075f4ccd5da

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