Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e21595c55e9cf0a…

MALICIOUS

PDF

82.7 KB Created: 2021-09-19 08:16:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 7c5ef513db12d5ba696ae10ecc9b072f SHA-1: 383b08f1b26e1c05f18a59bb429627860f6da605 SHA-256: 6e21595c55e9cf0a8202c2412cfb27f440bcc0fcbee22905f622ef7c6d0bc41c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or are part of link farms on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or directing users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct textual clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://zetrade.cz/userfiles/file/juramivozelojefuk.pdf In PDF document text
    • https://monographie.com/ckfinder/userfiles/files/rurejizexili.pdfIn PDF document text
    • https://dpengineers.info/admin/userfiles/file/fipeworogenamemofo.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161463c6fd7fd0---30054497244.pdfIn PDF document text
    • https://vientangluc.com/upload/files/panelobam.pdfIn PDF document text
    • http://baove24h.org/upload/files/wokivopagenugekipikufe.pdfIn PDF document text
    • http://soyaksiesta3.com/userfiles/file/xononanavizevuderaku.pdfIn PDF document text
    • http://lemonsport.hu/upload/file/nurutijojanidofoburima.pdfIn PDF document text
    • https://ostrichpharmaceuticals.com/userfiles/file/94139949896.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b00354678a---gabogowaxotewetoveker.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613bea3fe94f3---wutuwopikoweseno.pdfIn PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/govaraxufeviw.pdfIn PDF document text
    • https://ceylanotel.com/firma/files/66223634380.pdfIn PDF document text
    • https://karaari.leaddeehub.com/userfiles/files/wozoxirovoxunup.pdfIn PDF document text
    • https://ctcitsupport.com/media/files/vovosafomil.pdfIn PDF document text
    • http://redeyeldn.com/userfiles/file/zesalijojakilubufupuku.pdfIn PDF document text
    • http://innersolutions-uk.com/file/jidamaga.pdfIn PDF document text
    • http://ambvetfanini.eu/userfiles/files/71353967804.pdfIn PDF document text
    • https://www.domaine-vrignaud.com/ckfinder/userfiles/files/82685385627.pdfIn PDF document text
    • http://kiddeefire.com/media/userfiles/files/92506504536.pdfIn PDF document text
    • http://yingtailong.com/upload/file/210912125842981459dbmnbm9gbyzz.pdfIn PDF document text
    • https://immsac.pe/sgi_userfiles/userfiles/files/vuduxilutejusosut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=apk+editor+pro+apk+download+latest+versionPDF 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_off0000dee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE9 17532 bytes
SHA-256: 04b424fa7663f56c65902d7c76e503dfa8560cafaeb2d1fa0e1911daa37a5fb3
font_01_sfnt_off00010c50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12467 10608 bytes
SHA-256: cc631935928a52578c11c405e1e19932cb1b3dad58ec69a89a763ae9f2eb7615