Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdc7a9f12f3c04bc…

MALICIOUS

PDF

79.9 KB Created: 2021-09-23 21:31:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: dd5f0bad831c95346829f9ac3c70d64f SHA-1: 2291881785fc0e899c4253add9368d0de0d6a555 SHA-256: bdc7a9f12f3c04bc059601dc7ae5cb19a3e2af3ed57dbec814440ad03b559069
196 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, and exhibits characteristics of a browser extension installation lure. It contains a link farm pointing to various PDF files hosted on potentially compromised or disposable domains, suggesting an attempt to redirect users to malicious content. While no scripts were directly extracted, the PDF structure and heuristic firings indicate a social engineering attack aimed at tricking users into downloading further malicious content or providing credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://aneri12.eu/res/file/64743572918.pdf In PDF document text
    • http://studiovalecchi.it/userfiles/files/dewawajifod.pdfIn PDF document text
    • https://blugarden.eu/file/lopisenapexaxun.pdfIn PDF document text
    • https://frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/68693018921.pdfIn PDF document text
    • http://eurolocal.info/sites/default/files/images/file/zefedosit.pdfIn PDF document text
    • http://www.ruben.pl/ckfinder/userfiles/files/36975740456.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/31da8e71880c63e4b1c9818b99359a0f/jorovemabug.pdfIn PDF document text
    • https://lesura.net/userfiles/file/13339149278.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/05j4htd1rifa7tmmle72hdv77u/tigeliwadulamatibedo.pdfIn PDF document text
    • http://aurastaffing.es/upload/file/32259323993.pdfIn PDF document text
    • http://csc0516.com/userfiles/file/20210906124725_fgjrei.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e87f76c5e8---29253196194.pdfIn PDF document text
    • http://starma.pl/files/file/83376121694.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/galovokugazodinaxid.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/ramazarolitozirutujifo.pdfIn PDF document text
    • http://rs-entp.com/upload/file/fibuvimulufudironupavor.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/dff23be4d70d00d0f78ce7f2e7bc88a6/puvesixafomew.pdfIn PDF document text
    • https://lifeteacher.tw/uploads/files/202109012132523026.pdfIn PDF document text
    • https://autonoleggioassereto.com/file/dazobumo.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/kipajabipoxunuxodenobufo.pdfIn PDF document text
    • http://lola168.com/uploadfiles/file/wasavovevebi.pdfIn PDF document text
    • http://mofrantech.com/userfiles/file/solifepakisukuronupigumax.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/81198668673.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/wiletaxadukadoferefilubop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=chrome+extensions+android+tabletPDF 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_off0000d2ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2EA 10784 bytes
SHA-256: 355f9f1adabb3e0b61408e247bd5849729fd463fd8df4cb0be6ad03aa91c1f85
font_01_sfnt_off0000eb98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB98 18104 bytes
SHA-256: 20b60b4305b1df0868e548f9ac0a4ba3af04fa1fffc9fc56bde6b6a6364330e2
font_02_sfnt_off00011a37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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