Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6273fdd99a6a9ea…

MALICIOUS

PDF

77.0 KB Created: 2021-09-24 10:32:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 85d8b14572651e7de74318c1ea1bb285 SHA-1: 5108dcb555b9d6b4c5c38e7120014838c34eb26a SHA-256: f6273fdd99a6a9ea58509fd9001fbe5fc6b3b24d0c3a5e7746d7f23dded68c37
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external URIs and is identified as a link farm, with many links pointing to disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the link farm suggests it's designed to lure users to malicious sites, potentially leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://archism.ru/uplcv?utm_term=mojang+guide+to+survival+pdf PDF link annotation
    • http://yusungchart.com/userData/board/file/naluneresovofiz.pdfIn PDF document text
    • https://newline-eg.com/userfiles/file/mobimokixavefale.pdfIn PDF document text
    • http://thaiurethane.com/userfiles/file/18795410461.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161457dabe050e---3179849941.pdfIn PDF document text
    • http://studiotecnicoprato.eu/userfiles/files/xegepun.pdfIn PDF document text
    • https://ykitraders.com/UserFiles/file/wumag.pdfIn PDF document text
    • https://olgunbey.com/upload/ckfinder/files/60077545400.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/9s53ilq8jtqddqvbqo9j7javr7/17008886347.pdfIn PDF document text
    • http://vividconcept.in/userfiles/file/99030578788.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/fevigowu.pdfIn PDF document text
    • https://etadelloro.it/images/file/xinojabukazeboxitinad.pdfIn PDF document text
    • https://pacantioquia.org/aym_image/files/buvuvulepokad.pdfIn PDF document text
    • https://lapakunited.com/contents/files/79843699199.pdfIn PDF document text
    • http://elma-itc.ru/!upload/files/78782643385.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6945b0f48---zasozivemuwomabupanugi.pdfIn PDF document text
    • https://eric-parnes.shortex.com/ckfinder/userfiles/files/76043930238.pdfIn PDF document text
    • https://cordovajewelry.com/images/file/fofur.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/gefolarugagamenojurelidu.pdfIn PDF document text
    • http://www.yeosung21.or.kr/ckfinder/userfiles/files/1631962221.pdfIn PDF document text
    • http://delta-serwis.pl/pliki/sunepogozesizika.pdfIn PDF document text
    • http://biogenetec.tw/image/files/20210902_111824.pdfIn PDF document text
    • https://www.fangjin.org/ckfinder/userfiles/files/91072393570.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_off0000c5e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ddf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF2 18024 bytes
SHA-256: 19dd8e269e9120e847ca6affad9fc710dcb37f6983041698d6010addeac9d532
font_02_sfnt_off00010d5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D5A 10960 bytes
SHA-256: bed97c4dddf56b6d8312568781130c8090fe6e4c2eec0a36eed59737285dc95a