Malicious PDF — malware analysis report

Static analysis result for SHA-256 d16ef6abc4d52cb6…

MALICIOUS

PDF

85.5 KB Created: 2021-07-08 05:06:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f0a6dcd15e92ae2a6ff3b396dd124ff6 SHA-1: d64fc9dc24539105671401febb1adbf386bfdea2 SHA-256: d16ef6abc4d52cb66a4bafbee26611ca6219b54a56e2b064ab7d04c518458c12
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many pointing to compromised WordPress sites or raw IP addresses, suggesting it functions as a link farm. The primary purpose appears to be redirecting users to potentially harmful content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://medvor.ru/uplcv?utm_term=love+does+discover+a+secretly+incredible+life+in+an+ordinary+world PDF link annotation
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/1e9235bb7df5cd1fcd0967b39a2d934b/36893238475.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1ed554a8f---47021292234.pdfPDF link annotation
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16086d6ab8e28a---53147539714.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16084fb4f5f4e5---78956770286.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607501198f53f---14967260279.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/97839095986.pdfIn PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/puluz.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/8473515665.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb63e832af---norotozafejiwo.pdfIn PDF document text
    • http://skoleniridicu-online.eu/ckfinder/userfiles/files/6434123090.pdfIn PDF document text
    • http://ventiliatoriai.lt/js/ckfinder/userfiles/files/11198529154.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096b966d37e4---luzimeratebikebimavaf.pdfIn PDF document text
    • http://koslita.eu/ckfinder/userfiles/files/24543492852.pdfIn PDF document text
    • http://eaeocs.com/clients/c/c7/c75ed17bfa54634cfc1039f1b599a7e7/File/rufudilesanagifozajigid.pdfIn PDF document text
    • http://infinivideo.hu/sites/infinivideo/files/gebapipajujoredewobaxala.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/c967a7e8242c340acc8d6c896d708bc9/66376292447.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e4e126b70---muvuropewugugewotaniro.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1f82c90401---55212109836.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/pajupuridopemega.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/e8d216c998263cb12e19aa50193c6ac8/51237647944.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608d0b21f19b6---meboxogevimevifuvoku.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/e962be3cc1c701aa829fca6e1a6abc6a/zufujuxoduvavudetolus.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/jelanabewinatapixo.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_off0000eb76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB76 10832 bytes
SHA-256: 5c156cbecd937deae7b057ecce2fccc9e9e9716e1599e8902e3c0ac9aebebb52
font_01_sfnt_off000104a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A4 16752 bytes
SHA-256: 98029f2f203a7b2b226008d2325cf0a8cb4b407c5024d0411b7b743f4c5eeb48
font_02_sfnt_off00013028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13028 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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