Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d418b2d04b455c0…

MALICIOUS

PDF

81.7 KB Created: 2021-09-12 13:57:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3456f7ad5523c70e9c528956f90b604e SHA-1: 113058fa442e9780b16152e9dfe1a08c10932005 SHA-256: 1d418b2d04b455c0d34c137dc72144b71b81f6feebd90ca9986f8e5f497f1f80
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and links to compromised CMS upload storage, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself is used to host and distribute links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://philabc.ru/uplcv?utm_term=free+app+for+cheating+spouse PDF link annotation
    • http://trips-in.com/ckupload/files/sifenokizimirofu.pdfIn PDF document text
    • https://phoenixturkey.com/upload/ckfinder/files/wumawutikadew.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16131cd08b6dfd---19597752627.pdfIn PDF document text
    • http://travelbilet.ru/sites/default/files/file/vofukefizeref.pdfIn PDF document text
    • http://excitechem.com/userfiles/file/niwefizim.pdfIn PDF document text
    • http://vestmorecapital.com/images/epost/75615288106.pdfIn PDF document text
    • http://xn--42-jlclgg6a3e.xn--p1ai/userfiles/file/mutarevaxepuwoseneb.pdfIn PDF document text
    • https://micsys.in/userfiles/file/47997439757.pdfIn PDF document text
    • https://mayphoviet.com/media/ftp/file/41409480750.pdfIn PDF document text
    • http://betheaskssd.com/flash/betheaskssd.com/file/85387572317.pdfIn PDF document text
    • http://tetrafluoro.com/upload/files/nugetuwarel.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16130c9a047e18---60609901455.pdfIn PDF document text
    • http://garmaclima.com/uploads/ckfinder/files/99702483000.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16137d36ee0b84---96058110976.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/9001de780418f639cde729afe27d5d5c/23105399354.pdfIn PDF document text
    • http://nonstopsushi.com/uploads/files/60503055047.pdfIn PDF document text
    • http://winterwonderlandzundert.nl/uploadimages/files/95789189536.pdfIn PDF document text
    • https://tattica.byespresso.com/app/webroot/files/upload/files/71960101166.pdfIn PDF document text
    • https://www.leasing.net.in/ckfinder/userfiles/files/18384450087.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161350ebd57d56---denujadutulejigoverevobe.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/bulurejamixejigefijo.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_off0000db3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB3E 10788 bytes
SHA-256: c011d7a00194334934cfbf90dc76982734ee971ad6120b92c3839ebfc4bc3c01
font_01_sfnt_off0000f407.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF407 17920 bytes
SHA-256: e501a1f785df9a1c78ae24c0df23d66cbeb118bd627f906d1e34f9ce36b83485
font_02_sfnt_off000121af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1