Malicious PDF — malware analysis report

Static analysis result for SHA-256 cac79a57f1071384…

MALICIOUS

PDF

72.5 KB Created: 2021-10-03 05:05:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b99ddbac757737ae0d9d8c9705b0c420 SHA-1: 428b5e5933c41bc2a425b4f3274c23890ed8a7c2 SHA-256: cac79a57f10713841c5d612383c40e169054a7c61c5bc4aa7d2e6df833ff2f6e
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 threat. Heuristics reveal it functions as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, likely to redirect users to malicious content. No scripts were extracted, but the structure suggests an attempt to exploit user trust via a seemingly innocuous document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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://labelmarket.pl/data/file/33952180762.pdf In PDF document text
    • http://orikon.net/Images_upload/files/9236968460.pdfIn PDF document text
    • http://cmf8.ir/data/file/manevofolakewuzajosurogog.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/rev5qv0putvbrrvhgaoe7p0vo0/tafumozeta.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/17361277634.pdfIn PDF document text
    • https://charterboatdeliverance.com/uploads/files/dasizebegegebotute.pdfIn PDF document text
    • http://www.sintsprev-ms.org.br/ckfinder/userfiles/files/50423475432.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/266bc6fa8135e250582e283abc11680f/zufixirixerokedezawetal.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/jologepimagorujuruwifevov.pdfIn PDF document text
    • http://neuchina.org/userfiles/file/8129930602.pdfIn PDF document text
    • http://www.waetsukai.jp/system/ckfinder/userfiles/files/91004901410.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/gprsle3968q3nl7geapurkgi65/90119565048.pdfIn PDF document text
    • https://samsungdvmklima.com/upload/ckfinder/files/71657841716.pdfIn PDF document text
    • http://culvercity.ilovepokebar.com/uploads/files/riravopopu.pdfIn PDF document text
    • http://neapol-m.ru/usr/file/54504550484.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/zitamajukewapakumosek.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-9-18/20210918083108660353.pdfIn PDF document text
    • http://bckbytow.naszbip.pl/img/upload/files/98354336737.pdfIn PDF document text
    • http://abwninemile.com/uploads/files/sonuvegupi.pdfIn PDF document text
    • https://majubesar.info/contents/files/92770337272.pdfIn PDF document text
    • http://rfychina.com/upfiles/files/16310477708961.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/16158adeecd126---gijujepu.pdfIn PDF document text
    • http://brunagabriele.it/userfiles/files/kekedij.pdfIn PDF document text
    • http://tangneylaw.com/admin/images/file/tesidunomuxafuruturutib.pdfIn PDF document text
    • http://suitianhose.com/uploadfile/files/tonibo.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/lomogopupuzuge.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=when+you+kiss+me+like+this+celine+dion+lyricsPDF 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_off0000b4d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4D3 17792 bytes
SHA-256: 114e5f587e982ed918d4ab2619c6dd8e85922d1e824c445931882d77a54dad11
font_01_sfnt_off0000e118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE118 10772 bytes
SHA-256: 725113d990dae4e9816a4cfb9a9f4522b8944f75073eb0bbc327c635252c7ef1
font_02_sfnt_off0000f9b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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