Malicious PDF — malware analysis report

Static analysis result for SHA-256 bee8c7a382060f75…

MALICIOUS

PDF

83.0 KB Created: 2021-09-18 17:30:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3c09bb2140e339f11177a1c7b5efc045 SHA-1: a5d30addde4ef5b902640a53f7c53fd70ba5ed9e SHA-256: bee8c7a382060f758ac0869e5456ce57cf985af84dbe5cfb90d9f2d682bcdcbe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm with numerous URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a large number of links on potentially untrusted hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://nomylo.ru/uplcv?utm_term=simcity+buildit+cheats+iphone+2020 PDF link annotation
    • http://thepokeluau.com/uploads/files/xofogukedebapulalikafok.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/2625f6e1d7d0da969a9ea246e53f109d/27382847211.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/vq8s5edm55lrdufmdjsothhqob/49906921515.pdfIn PDF document text
    • http://96rangjai.com/userfiles/file/14267128239.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/xogubamizifubejafekij.pdfIn PDF document text
    • https://colegiumaniucarei.ro/ckfinder/userfiles/files/16948069301.pdfIn PDF document text
    • http://xn----7sbbgprpk7biiq.xn--p1ai/admin/ckfinder/userfiles/files/bopugepelituta.pdfIn PDF document text
    • https://leonardscopysystems.com/home/leonards/public_html/ckfinder/userfiles/files/76792212038.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/16532811294.pdfIn PDF document text
    • http://gevenschoenen.nl/ckfinder/userfiles/files/dutizewunepavupep.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141b92de7533---zesipatawulifaxureworut.pdfIn PDF document text
    • http://polimak.pl/userfiles/file/nagafebi.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1613998854e98e---pijowo.pdfIn PDF document text
    • http://pcserviszlin.cz/ckfinder/userfiles/files/25408071995.pdfIn PDF document text
    • http://lahma.pl/_u/userfiles/file/sojukozo.pdfIn PDF document text
    • http://gioiacompany.net/images/upload/file/nowelutofagasupulineru.pdfIn PDF document text
    • http://bosch-elektronarzedzia.pl/catalog/file/52361022939.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/161314b1697725---datajagizuvatajave.pdfIn PDF document text
    • http://longtra.vn/userfiles/file/37056028812.pdfIn PDF document text
    • http://tetraeng.it/userfiles/files/85617493760.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/nopobarefike.pdfIn PDF document text
    • http://harekatmemuru.com/images/Media/files/19088231390.pdfIn PDF document text
    • https://willes-gb.com/uploads/files/202109072254164307.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16133ba3468f01---95163114896.pdfIn PDF document text
    • https://perfectsextherapy.com/public_html/userfiles/file/37134904874.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142adc3c943d---39430782903.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_off0000d8d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D1 19672 bytes
SHA-256: f1de64e35c6ab5500ee1ebd9461d598622a8a1d7cf53d73413c1996a6b80fb89
font_01_sfnt_off00010bd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD6 11348 bytes
SHA-256: 3a4ea998ee0c99a02060bbf7f2cdf66ab629e3b7a456c787f29f2adfe950e0cf
font_02_sfnt_off00012634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12634 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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