Malicious PDF — malware analysis report

Static analysis result for SHA-256 d56145555cb6b2f3…

MALICIOUS

PDF

77.2 KB Created: 2021-09-07 18:13:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9580694a9ef3139c664d09497b4a6f81 SHA-1: 875b3f64a44070644e68d0f8f396a241e89080be SHA-256: d56145555cb6b2f356c9155ee6d7204aa77d6f5efccd6b133d41d10c1459148e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs pointing to compromised WordPress sites and disposable hosting. These elements suggest the PDF is part of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://hyundai-baoloc.com/luutru/files/wasalewewopu.pdf In PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160aca0553f037---zoporazosinoj.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e885273aad---jimonosimabatupanolaxerel.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/65361399188.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160cff75d193c0---metavinibemumomuwutolawag.pdfIn PDF document text
    • http://zzquansu.cn/d/files/vodotivomukixivatotexuf.pdfIn PDF document text
    • http://cottoneauto.it/userfiles/files/nedolirotejedadobowenezi.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/6jn0uvrd4pnppbva9ca0jmcomq/99681056137.pdfIn PDF document text
    • https://x-software.cz/data/file/ruboluvobun.pdfIn PDF document text
    • http://orderkai.com/uploads/files/15787158251.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcee181cc6---suvubamezibobuwubaramoxor.pdfIn PDF document text
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074b2d4ea474---mufasuw.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1606f44cd84a6e---36127205227.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/gavezeri.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/15797806613.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/sovarepufowebuzuranuvux.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/e24d96d545fe546ed4167b208a52e07b/9233344370.pdfIn PDF document text
    • http://eldmsh1.ru/js/ckfinder/userfiles/files/xumuwanobugasebikekirofi.pdfIn PDF document text
    • http://ankaraeksioglu.com/resimler/files/91898002678.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6c255919e---jejosememubuxogenetariwa.pdfIn PDF document text
    • https://pakistanchristiancongress.org/userfiles/file/mawavuzakeboguko.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/a444ca223fe170942d01190c314eb54b/47435787143.pdfIn PDF document text
    • http://yevres.fr/ckfinder/userfiles/files/bixixixilinow.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608785625df1a---varanulusovovi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=holden+captiva+7+lx+owners+manualPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c5d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5D9 11068 bytes
SHA-256: 13cad4c23208af60b168f76c2afa9b85dd1f9640ec81d1bee5a957ab10477c4b
font_01_sfnt_off0000dfa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA9 17572 bytes
SHA-256: e8680b1e7b08938536ca85cc9f16565b4f3560b755216d408e33c928ed355f85
font_02_sfnt_off00010d54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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