Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa9b537716d14845…

MALICIOUS

PDF

85.0 KB Created: 2021-09-01 03:03:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1823c4556927130b851bbec6cf3ba327 SHA-1: f491a4846c6e5878c661e8ab1460355d28bbd30a SHA-256: fa9b537716d14845bfabfa5f4a3d60ef2005cde1a2f3fa2fc20af35278b6de18
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. The PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristic indicates that the document contains links pointing to compromised upload storage, suggesting an attempt to host malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://absolutelyneon.com/userfiles/file/vanevo.pdf In PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/161210e2e6bb48---xaxuganato.pdfIn PDF document text
    • http://huerural.com/uploads/image/files/44422693731.pdfIn PDF document text
    • http://lammermoor.net/imagenes/file/rezug.pdfIn PDF document text
    • http://hncastlecable.com/d/files/10662009135.pdfIn PDF document text
    • https://4cmedica.com/ficheiros_upload/file/tuxenokexilizixuxisavi.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/sedojasebodozufalejexi.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/60264362559.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/5dff57a5c90548a7f5fb3fee04e96d50/gusesugozewasuki.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/f75d514496b26f4f472bc4d8193290d1/83322318592.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/a8abe980049e4b09609fba26bd50ed13/80907375090.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/a750f38acbe26126f16ce4b1785a7754/galovivinitosedolilok.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/4774b83a0c6ea72932b3e89cae15d218/16147341980.pdfIn PDF document text
    • https://lepjunk12.hu/uploads/files/bokadadaduxomuvawetomani.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/161201d3529730---pujumomusozovoj.pdfIn PDF document text
    • https://xn--bankkrtya-41a.hu/js/ckfinder/userfiles/files/12326882144.pdfIn PDF document text
    • http://nusratali.com/userfiles/files/48210597897.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/wepujarixowelilegofi.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/19e4e913aaa86920db145125eeeb90e7/mumibatewo.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16071e0c193f09---21350896236.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/puxedoxojoretovovuwifu.pdfIn PDF document text
    • http://szamosiszerviz.hu/feltoltott/files/vuruxa.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aabb67ceecd---37244004708.pdfIn PDF document text
    • http://elverum-revmatiker.no/images/file/1596687487.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=the+ballad+of+east+and+west+meaningPDF 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_off0000e2d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D1 10892 bytes
SHA-256: 2ead2f5a93fdb1b148e3daf77f55e14f7750e2bbe449520c19b506a91a8d2e72
font_01_sfnt_off0000fba5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA5 19184 bytes
SHA-256: 46edced18983c97096f1423bfc6a8bc71ec100e1790ce6d4e7cad74e9866deb5
font_02_sfnt_off00012e6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1