Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cc9287ec7d0e857…

MALICIOUS

PDF

78.3 KB Created: 2021-09-07 16:49:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 40ea7bffe0fe4758d812bc362828dcb0 SHA-1: 181834d4f0bb4cd041ebfad9a2ae04322ca9fec6 SHA-256: 4cc9287ec7d0e8573a554e9dcf517a2626fe68846825c814222c1fbb86726177
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely serving as a phishing lure or a distribution point for further malware. No scripts were extracted, but the extensive use of external links is a primary indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://allytemp.ru/uplcv?utm_term=now%27s+the+time+doug+goodkin+pdf PDF link annotation
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc5ba0ec31---tonosidenapudatida.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607502712c646---68881013892.pdfIn PDF document text
    • http://thefarmatarapahoecounty.com/userimages/38148860103.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/9fb11b77d2e62d97114174c45beb4871/44354453022.pdfIn PDF document text
    • http://www.miyadenthai.com/image/upload/File/58016747069.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/1e4f15051c5e09729cda7889ca293c69/28921142347.pdfIn PDF document text
    • https://studiovizia.com/webroot/img/content/files/jowofodoxakaral.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0cdcce785---83986839825.pdfIn PDF document text
    • https://stdtekstil.com/upload/ckfinder/files/58769715717.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/61577686103.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/rojedukokanipuni.pdfIn PDF document text
    • http://tms-technology.com/ckfinder/userfiles/files/44068271865.pdfIn PDF document text
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/d2ee3e5c2e1611bd96d859aeb33664b5/65424432827.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1609ea2027eedb---pejalileba.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1611ce2ac52aa9---81226112380.pdfIn PDF document text
    • https://hanul-muresenilor.com/wp-content/plugins/super-forms/uploads/php/files/9i8s2hqqoso0j8nmglbcqqdm7h/9034008520.pdfIn PDF document text
    • https://atesolve.com/ckfinder/userfiles/files/dajipejisu.pdfIn PDF document text
    • http://vilniausgreziniai.lt/userfiles/file/zatapo.pdfIn PDF document text
    • http://heatherjansch.com/ckfinder/userfiles/files/66215176049.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080bcd506ec1---87631682074.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/xegibalutiverodevivawa.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/p2qa6gutahepc70eghlppbcv33/94937439095.pdfIn PDF document text
    • https://milliondollardesiclub.com/upload_files/featured/files/nasonex.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/xemonenelep.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_off0000c920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC920 18344 bytes
SHA-256: bf22e8a2868bfc28fbb1aa201a717024c303b6d3208f4fc510197db56a9ee89c
font_01_sfnt_off0000f8d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D2 10924 bytes
SHA-256: 2d71d1a657598bf08d22e4d5ff420653de338cd9f49df40d80412453bab23819
font_02_sfnt_off000111d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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