Malicious PDF — malware analysis report

Static analysis result for SHA-256 9135adf829d96518…

MALICIOUS

PDF

80.3 KB Created: 2021-06-29 21:48:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 5f9d1e23ed5f74c7d2df48a108dd9ac0 SHA-1: b8ffd9f74fa6d1d04399369c7a0d4d26f2c7b50a SHA-256: 9135adf829d9651824e7c552ea42c04b9c283f1f6982b502af0af7cc0df8b954
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 CMS upload directories, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution via these external links. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL heuristics and AV detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/jkquh8phnfjba5rjrb7s0fqpot/59855077440.pdf In PDF document text
    • https://alshaabcoop.com/userfiles/file/71659457259.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607286af0c519---38650159616.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/senojawuxejezosor.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160a71ab96dfe9---81701596351.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/fcitjdiplrb2dgnh9aqc7o0qs8/10670579843.pdfIn PDF document text
    • https://mimpiindah2.com/contents//files/tuguludutabob.pdfIn PDF document text
    • http://foto-preiss.at/upload_files/files/nijidifadireg.pdfIn PDF document text
    • https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/05a6q7670k4brapptko9tpphpk/fovebi.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/45e683dbd4e8d369abb7ade60caf2383/guweguzibida.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/435178721ef347493e6ff4de66aa3383/dafitajuwutulugevomow.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/gaduguxaribub.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1607044bca2707---visokuniwolenaje.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/wirufijimisomusavaguv.pdfIn PDF document text
    • http://briarcliff68.com/clients/71184/File/61608656738.pdfIn PDF document text
    • http://thuexedanang247.com/uploads/image/files/rurubufurugukoz.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077c724445f0---bubidakesafal.pdfIn PDF document text
    • https://benjamindreyer.com/wp-content/plugins/super-forms/uploads/php/files/a117bdf4120bf0df1d6a49afbdf6f902/rujajamepapodagafe.pdfIn PDF document text
    • http://bomtvplus.com/data/board/file/20210513230048.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/acmh1b7nro5quolv3p0i72871d/98550637004.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/991e646f337352712d4c37a46807dcf7/gozimewezig.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/tuzesosawutenefomugagas.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/84efba9586dce75f73e12f1d82c198bb/wolejesujamuxa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=weird+facts+about+mePDF 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_off0000d398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD398 10720 bytes
SHA-256: c1968a2e9c233b63024cc29a8ee9aa90cb499a34c237990b9d1272881b766e70
font_01_sfnt_off0000ec4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4A 18540 bytes
SHA-256: 4ec612c455e87bbc31f50c9bdd6ed48f038b1e61a6ad1957b5730938cb467c62
font_02_sfnt_off00011c06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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