Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfe343869f7e67fd…

MALICIOUS

PDF

76.4 KB Created: 2021-09-15 23:01:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: aa08b83336780b649b3ee6b13203c495 SHA-1: dce12ed0143ae7cb6e225c35d8e8015c9d11d694 SHA-256: bfe343869f7e67fd2d8d8df136d911834ed5a48a75466d5f01e6fc1fa7ebcc4f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://chcial.ru/uplcv?utm_term=city+wars+game PDF link annotation
    • https://atpl.aero/ckfinder/userfiles/files/46925354191.pdfIn PDF document text
    • https://trouver-une-ssii.com/img/pics/files/janikixijibaw.pdfIn PDF document text
    • http://beerskiboot.de/img/upload/file/karevike.pdfIn PDF document text
    • http://gjbbang.com/userData/board/file/fezozunu.pdfIn PDF document text
    • http://ace-pharm.com/upload/files/rufasobebatafokisedeso.pdfIn PDF document text
    • http://music-summer-courses.eu/upload/files/kizusikuvuvisizuzevimuk.pdfIn PDF document text
    • http://3dprofi.net/images/uploads/file/jadesipupe.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/d1qfj9q2vp4krlftu3hq5si2q0/defanekonapawuzawufifut.pdfIn PDF document text
    • https://volgogradexpo.ru/ckfinder/userfiles/files/birepemujuxilep.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/161345baf3267f---jowarototisapefoni.pdfIn PDF document text
    • http://glina-master.ru/admin/ckfinder/userfiles/files/57494003616.pdfIn PDF document text
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/87572027309.pdfIn PDF document text
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/91595380191.pdfIn PDF document text
    • http://tradotel-riviera.com/file/daredotimajani.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161375175e1c86---5534329979.pdfIn PDF document text
    • http://gdlianyu.com/uploadfiles/file/34385574061.pdfIn PDF document text
    • http://scro.ru/pic/file/kemumilumiluxugazukofu.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/b4f0a693cf0e4834a15c289d244183fd/getumugegu.pdfIn PDF document text
    • http://knipia.com/userfiles/file/dowapokutijijipuma.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7dbf87c9e---geberamevikitosuridi.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/05dbe56b917f602bc6ac291b4d0b59dc/tigedanubekoxamifiwegiwul.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8f3f40652---65887253474.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_off0000c74c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC74C 17512 bytes
SHA-256: 3f4fd2973a72ad81897e94bbcd4cf30323b240e92ba551291a2f265e191463cd
font_01_sfnt_off0000f49e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF49E 10412 bytes
SHA-256: f9c4c5081eeb49dac4d8fb2fc1cbd2b0793f45b81cf1b0ccecf4fa8be24cc059
font_02_sfnt_off00010c5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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