Malicious PDF — malware analysis report

Static analysis result for SHA-256 39ed74d9e26f7fa2…

MALICIOUS

PDF

69.7 KB Created: 2021-05-07 10:08:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b974ad2d03e3b439490d752450be84fa SHA-1: bbaddf42fc1a0961fdb871173cddc7cf87cc40be SHA-256: 39ed74d9e26f7fa2401eca08abd94a2b35410f472fa98b93d754344ed693949a
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous links to compromised WordPress sites and disposable hosting, suggesting a link farm used for distributing malicious content. The document body, though heavily obfuscated, contains keywords related to interview questions, likely a lure to disguise the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://inwebjor.ru/uplcv?utm_term=spoken+english+interview+questions+and+answers+pdf
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16081a3ce8dfec---21955484964.pdf
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/38dd6eb80e84e6dd96da5b98976075d1/gesamuru.pdf
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/dp0oc4kf25mttu2oobu1hrn16v/juvexed.pdf
    • https://advance-pack.com/editor_upload/file/wezozilizisata.pdf
    • http://acecaalcoy.com/userfiles/file/pojoropa.pdf
    • https://angelsstaff.com/uploads/file/6934179995.pdf
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607887fdd162a---sigosotowa.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607e03c519bc7---banubuj.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072d47482f9b---bowemonemonorikuvopame.pdf
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/aa78hqklijecjgc64d4ekbbmi0/wepolisubuxifobikosaw.pdf
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16087777636060---2793807367.pdf
    • https://luyenthitoeic.info/userfiles/file/mevakotobaxerepubix.pdf
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/e1f05a5a236be79dc22479ad85851856/vusezajasawifiwuloxa.pdf
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/335a20241288e95e47e5c3a3f832ec15/kukogew.pdf
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16094877733480---kavedejotisisateruma.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4a4.bin
ac06dddce8bbe19d9b0970263eb7f0ee7e87a601caf054fa6ef3b71ead239a2e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A4 5748 bytes
font_01_sfnt_off0000e838.bin
447e27c8fc00a359eb8c4355ff5e7886f71a91b053ce2fbe4d85d0009f944d10		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE838 9848 bytes

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