Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9ed2d8088287de3…

MALICIOUS

PDF

90.3 KB Created: 2021-07-01 15:08:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 62b558cf0116dbb9aa202df7c0daabd0 SHA-1: 7606a787a58a6f3a6adef054e3a86c17383d0eca SHA-256: c9ed2d8088287de3ba4a6b7ab6b07f0820982c08095795e65868efd5d5649db8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content or phishing pages. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of external URIs and the nature of the heuristics point towards a spearphishing attachment used to drive traffic to attacker-controlled infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://chcial.ru/uplcv?utm_term=the+cast+from+the+wiz PDF link annotation
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608baa0e3dfd3---67411052595.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/c26b6d9011c4f1edbd5d3e6d0d279646/19662640770.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160945a24e43a1---99581978091.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a92e42891cf---20693620817.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/a49ff07427a20b4439607df8e581446c/detunevovafedomev.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8a12d55a7---8777903125.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/9891f6ca246386b63f128638a2f49ad2/tumekeposukadomarilax.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/suxofedamizavozom.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/5c49050ad782cb57fc2d5dcf7bf13c74/87804077709.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c14cd2a7b3a---60370801711.pdfIn PDF document text
    • https://t2sc.me/userfiles/65516362095.pdfIn PDF document text
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/3388136587.pdfIn PDF document text
    • http://slsnn.ru/content/files/38257962888.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/peq265okpdtml03mlusu5sdfk1/kovatixegijuse.pdfIn PDF document text
    • http://starke.ca/clients/84205/File/13368538000.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c729b981431---dadazelagunafenove.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071c65c15049---pupul.pdfIn PDF document text
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/60291327909.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/c57796eaf3a57e0c5a0ef66fd072d1c3/vemanupuwube.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087f79bde879---towovezop.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/f948f7c39d89a7d9c7ce449fc5bebea4/zetujojofotinojinid.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160cc0a9dd3e3f---85789095546.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/61272493234.pdfIn PDF document text
    • https://zanhotel.ro/beficientconsultingFiles/file/79912417922.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a8eb882fb7---44575915126.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_off0000fe75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE75 10560 bytes
SHA-256: 8a1ca0d922964668d091f406b57b2b2c853b552c3fabd85ac131e72020e54171
font_01_sfnt_off000116b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116B1 17400 bytes
SHA-256: 837a643e80c26e3a7d0fc1e5f39af908feb5be4c8f9a7732c7d9a2040c6aba4a
font_02_sfnt_off00014417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14417 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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