Malicious PDF — malware analysis report

Static analysis result for SHA-256 75acff17c997d4fa…

MALICIOUS

PDF

82.9 KB Created: 2021-09-14 09:31:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e13c94df4d73ed015093e5b909c0f13c SHA-1: 592dff4a3f342d240076f610987d8b227c40ed01 SHA-256: 75acff17c997d4fab374fe1e3c51559e42b52fd84d6d1c3a3eb161659903cf2d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, suggesting a phishing or redirection scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://newsru.md/upload/userfiles/files/47523181182.pdf In PDF document text
    • https://hoangvan.vn/wp-content/uploads/files/molofikitowud.pdfIn PDF document text
    • https://loyallcanada.net/editor_files/file/nodumolavapag.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/00f22a6bf3d6420feb52815b6b08fe66/topulabimunem.pdfIn PDF document text
    • http://tivatijapan.com/uploads/userfiles/file/temabotulegumadamajosuba.pdfIn PDF document text
    • http://maymaygiaydachidang.com/upload/files/3588248611.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16135ef0be17a9---faterimul.pdfIn PDF document text
    • http://cleanyachts.it/writable/public/userfiles/file/wapibuxej.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/33d493fa11a75f7e41d28356eea9e93a/86537629453.pdfIn PDF document text
    • https://ht-cooling-j3t.com/contents/files/2277470821.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/situlakovifaz.pdfIn PDF document text
    • https://ateliersmq.com/pevron/www/img/file/3914871483.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136121da8b97---48902441150.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/pojitu.pdfIn PDF document text
    • https://doctmcooper.com/userfiles/files/fizun.pdfIn PDF document text
    • http://dietaltop.com/userfiles/files/vakovezubawujugus.pdfIn PDF document text
    • https://kawanmto.info/contents/files/nekadata.pdfIn PDF document text
    • http://decoworld.in/dayafter/uploadimages/newsimages/file/tepusumagatak.pdfIn PDF document text
    • http://unionnutritech.com/upload/files/faleko.pdfIn PDF document text
    • http://slmj8.com/data/userfiles/files/moximukupen.pdfIn PDF document text
    • https://tavfelugyelet.megujuloenergiapark.hu/admin/ckfinder/userfiles/files/wewajaboten.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1612eee1f3d7e6---16754840244.pdfIn PDF document text
    • https://alariel.be/userfiles/file/94075728469.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/161344ef44e6a5---jugapexilejo.pdfIn PDF document text
    • https://milsagliksen.org/upload/ckfinder/files/13415550442.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/41789817978.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=cara+edit+video+dalam+videoPDF 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_off0000e489.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE489 16500 bytes
SHA-256: c872b425090a924e361da4e9de3d8768ac9fef0c1815e0e6bfe832bcb4362e3a
font_01_sfnt_off00010ee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126FD 10232 bytes
SHA-256: 5f52be4441f84785742ebf7b10e8539f89eb0068bafb08a81e201a1b4024c4cf