Malicious PDF — malware analysis report

Static analysis result for SHA-256 660f3d874790a731…

MALICIOUS

PDF

102.1 KB Created: 2021-07-04 09:11:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: e16a9d8dd1993b94b57c49266a0e419b SHA-1: d68e0c380b26e870f3b5d51a3dc3103fbd4b8ee5 SHA-256: 660f3d874790a73183904cf7b5b3dc3cbebd1c3deabef49c3101dbe9bae88465
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of external URI heuristics and link farm indicators further supports its role as a lure to potentially malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://smidgel.ru/uplcv?utm_term=discord+d+and+d PDF link annotation
    • http://karthikeyanjayaram.com/userfiles/file/40337418018.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/c2b7a5765b56334eec017dc9393de93e/xemiborowusuw.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984146b4c32---tegojogijet.pdfIn PDF document text
    • http://smclassof57.org/clients/34860/File/65598558485.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160800b5be4e4f---benisedufoxudo.pdfIn PDF document text
    • https://welltowork.org/wp-content/plugins/super-forms/uploads/php/files/fdf5a774e0a4272ef08fa4d252d0dfd7/muraxofaduxesujigolu.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e38ac0a8ed---79006371770.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/9uu3rq4l1r4vbrjs99mg46i2bi/nuxalezorozowotilopifelu.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/1d17525f4d52230b4d3a92f02e2b065b/doxotusaw.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a3c7b5915---63217258545.pdfIn PDF document text
    • https://kristinanamaste.eu/files/fipezininidupilofodapuxu.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/2a812pukg6jljmmipkla5vvhhv/wavarafewivo.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160be30460d427---makut.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/c57lika1635u9setutelk3jhi2/55314227172.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/d675073326b5acd3ec761ef957ff24dc/zuzov.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210626014657.pdfIn PDF document text
    • http://christopherdallo.com/file/8247514207.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e0980b7a7---damimovagitizuvoluba.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/jirizuvuwimeten.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/eh6bvh2t0kq7486aj8grl0h6js/sisafoterawatepoxivixim.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/605f5be0f7a26bf12718127cf47bdd97/37967055474.pdfIn PDF document text
    • http://tuanlongland.com/upload/files/45538677609.pdfIn PDF document text
    • 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_off00012c33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C33 10088 bytes
SHA-256: b33bd190f6e52e7ab3fd922d42f7d7cda1ef24b0eb5aadb0afe170fd57ac56b6
font_01_sfnt_off000142b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142B3 17936 bytes
SHA-256: 1ccc3a168e6e58ecc8c16d084504d4af28c50c68e4997d533c674685fcdd41cf
font_02_sfnt_off000171f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x171F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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