Malicious PDF — malware analysis report

Static analysis result for SHA-256 588986aba5db27eb…

MALICIOUS

PDF

70.7 KB Created: 2021-10-01 16:47:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 2c856fa391f44c71e8b9f9019793be22 SHA-1: cbf01f188074569b43cea977baf69f49ab1eeac8 SHA-256: 588986aba5db27ebb6669116b18ce290889102b075553cd395385c3a92a41f82
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. This script likely redirects the user to external URLs, as indicated by the numerous PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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.
  • 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://crysiq.ru/uplcv?utm_term=filmy4wab+xyz+movie+download PDF link annotation
    • https://ateliersmq.com/pevron/www/img/file/12987569523.pdfIn PDF document text
    • http://hotelbelleepoque.bg/userfiles/file/34032580504.pdfIn PDF document text
    • http://homeopathyhk.com/files/wusokuzawoxe.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/11574513568.pdfIn PDF document text
    • https://agatanorek.com/files/file/26552948489.pdfIn PDF document text
    • https://censcakmu.org/board/file/files/25103973822.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615258691119a---27409358236.pdfIn PDF document text
    • http://hiroi-es.info/yamituki-n/uploads/files/82749712228.pdfIn PDF document text
    • http://sportingfoundation.com/uploads/file/rivebopuxulirogoxarowe.pdfIn PDF document text
    • http://shijijiaming.net/filespath/files/20210920121002.pdfIn PDF document text
    • http://kajo-frings.de/userfiles/file/wajab.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/koderopezat.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/bufepomurefepuzuti.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/1kiud4701uap9gs6id8fd1p4t6/jezevenitonalafa.pdfIn PDF document text
    • http://www.dkmodels.net/ckfinder/userfiles/files/zaxubopomalilulan.pdfIn PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/25341334350.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/84297996596.pdfIn PDF document text
    • https://letajicikoberce.cz/userfiles/file/zetijaduzekivufi.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/53625778184.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1614898a2d5cad---gigoselukekibasozujejut.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613316a5a45e0---jezatewuxi.pdfIn PDF document text
    • http://kalikraft.com/images/file/25633748164.pdfIn PDF document text
    • https://zohopinler.com/calisma2/files/uploads/jowos.pdfIn PDF document text
    • http://redondoclassicburger.com/uploads/files/35386869889.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_off0000b12f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB12F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC941 16432 bytes
SHA-256: 9a7e2edef9b84baf2f21269a42cfdc2cab137b6f8d1fc0ef54c8cb93b7a4e042
font_02_sfnt_off0000f34e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34E 10668 bytes
SHA-256: 4bc9f009bc7a6ef1fd1a5478d0962ec6790852b3cc3b1655b4b7272aa465e838

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