Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f9bc5d4cc3bf4f5…

MALICIOUS

PDF

101.0 KB Created: 2021-07-17 07:31:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 4c839559ffcff99dab2720249be11844 SHA-1: df577f064191f0dfeaf3901d2ffd276583e535f1 SHA-256: 1f9bc5d4cc3bf4f59b8bc6100aa817ad974bc32cfb2edb05d8bd45c6e22fad95
156 Risk Score

Malware Insights

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

The PDF file contains a large number of links, many of which point to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to download further malware or engage in phishing. The primary attack pattern involves directing users to malicious content hosted on compromised or disposable infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9253

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://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/btsedat0q9qhh0aa2qd4aeriqh/pesejanirozumuzunak.pdf In PDF document text
    • http://bjjiffy.com/upload/44642637882.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/brd5gpdmbjdisogibus1nomp87/4305345143.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210615180536.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/i56s05v9n527du6nqvgcltiiuh/didum.pdfIn PDF document text
    • http://lhjmfamily.com/clients/5/5d/5d8645f74963a96e1aea25f3b610eff6/File/98488791486.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/c5a2953904044292cf6f2cdf46c1f79e/40062548998.pdfIn PDF document text
    • http://tele-klass.ru/i/upload/files/zodar.pdfIn PDF document text
    • https://aravlicraft.com/cmsCart//upload/file/59570798515.pdfIn PDF document text
    • https://ivaco.it/file/82034621086.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/7321253254.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/5b88a4d4808506b7e9b713049d73f147/zeguzomarivan.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/b08d1959012c67e87bce6ef04875ce81/80287919041.pdfIn PDF document text
    • http://dungcubepgiangtrinh.com/webroot/img/files/rosogijupud.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/82286001534.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160aa111b149d7---zomawikorosidubufe.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/zigoromeveligapud.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/7c86702106a034e20d89f8c6a4b43477/59622337117.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d09fb61916---85237157926.pdfIn PDF document text
    • https://lemanssrl.it/file/84885955820.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160756b497d9ba---55666280224.pdfIn PDF document text
    • http://pinturasoltra.com/images/slider/files/fipozosigasobevodesepiwaf.pdfIn PDF document text
    • http://nsk-nalogov.net/upload/files/99990087469.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6bfde1ae8d---62360439252.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/187efca8a222655ab856c4361b47646c/xirezaninajapisepo.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/nabegurabana.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/d5a3c5860402e39572c3634c1246efcb/79659864782.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=determinant+of+a+3x3+matrix+calculator+with+stepsPDF link annotation
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000103e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E7 1728 bytes
SHA-256: 8bc175f4a4f5cac64792babdad517d65aba3552260b022de7cd4c86cbad4686c
font_01_sfnt_off00010c00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C00 16084 bytes
SHA-256: dae5038d748b2b7d89173d83a61ff0ceefc2856cc76f3bb6f5837745f88f8889
font_02_sfnt_off0001212b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1212B 18560 bytes
SHA-256: 29ac6e94835bdc66f95e655997d2098b5e8088c8874b81341c1b58851b3af736
font_03_sfnt_off00015304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15304 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off00016b1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B1B 11204 bytes
SHA-256: 823e061b2aa067bd1c7616fe9d306772efefedc4769d63cb17c0d5bc65976bd1

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