Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac988be498315584…

MALICIOUS

PDF

139.2 KB Created: 2021-06-26 04:52:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 90660ca32eedd7d98b168275c17abf1a SHA-1: 03434034f7535ce28e82e8a030fbad93b518efd7 SHA-256: ac988be498315584c88de83f1a1fc22b1072ddff4f473757110105e871a22504
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, likely to distribute further malicious content or phish users. No scripts were extracted, but the structure and URL patterns suggest exploitation of PDF vulnerabilities or social engineering to lead users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://responsible-tourism-alliance.com/content_file/files/kagorimajizobupegidenenok.pdf
    • http://chroscina.com/userfiles/file/xaresit.pdf
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/c9c483b69be75bcc4fa3d643b88bcda0/18770730659.pdf
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/29146966760.pdf
    • https://chmelo.hu/sites/default/files/file/nobatidunideveduwapejuk.pdf
    • http://suamayin.biz/userfiles/file/92254805673.pdf
    • http://czdashan.cn/uploadfile/file/2021051006451673499.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/64649gegu1ku0okvv5kj6chrc2/wifepada.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e831a33044---35637643672.pdf
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16082f5ef358bf---93663473068.pdf
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c135f05b2---79018748142.pdf
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16081d1eb5d566---97591540092.pdf
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/96cff60717dcb87707711cccdd3bdd65/zosuvudovizakemeweka.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/3f2c90c6cee3e0341e487d0d8aa8b063/26028422362.pdf
    • http://adamlegal.com/userfiles/file/lozunadibazulimeripelili.pdf
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ba6b0652dbd---vivetudikozirupupemite.pdf
    • http://ceomit.com/fckupload/file/79533074395.pdf
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160924047baf5b---mubotowunejobavulaxexex.pdf
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/dd166e2cfcda5739b528e52446b11434/8399286248.pdf
    • http://foto-klub.dk/userfiles/file/gikisixapiwosoj.pdf
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4329ac780---73210684757.pdf
    • http://primaria-ciocirlia.ro/media/file/96412092750.pdf
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/pkiidpa6oqu9astqjb1amjbuno/56243372773.pdf
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/c597c798cc53ebcb4f6c613bd43b8870/18817159126.pdf
    • https://pypconsultores.mx/userfiles/file/jirizasoja.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=elements+that+share+properties+of+both+metals+and+nonmetals+are+called
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001b950.bin
3945b0fb4fc80563390de8cb25ca9b6767fdb4b1e42233a4469e49c9aff3a3cd
pdf-font-stream PDF embedded font (sfnt) at offset 0x1B950 20460 bytes
font_01_sfnt_off0001ed22.bin
ddd1386ab27ce015acf838533145de44b4ffda0061d6dceb9ca763feba483bd0
pdf-font-stream PDF embedded font (sfnt) at offset 0x1ED22 11008 bytes
font_02_sfnt_off0002063c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x2063C 16792 bytes