Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e2543685b3619bc…

MALICIOUS

PDF

76.4 KB Created: 2021-08-28 18:19:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9e5009aaf3b9e1e364caf79a5e9c0f2b SHA-1: 6eb1f5b69f28f98c6743f9e4547cd4d3ad7d8a14 SHA-256: 8e2543685b3619bc51b66657fa7bd601df50348a57b54660fd6dac9182a000b2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute phishing content or further malware. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 https://irlanc.ru/uplcv?utm_term=water+in+silicone+emulsifier PDF link annotation
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/918232c335ccb3c69e21ed4f14ac44b5/30416387373.pdfIn PDF document text
    • https://technische-dokumentation-hoffmann.com/upload/files/vobuw.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/361162a105a57d3e6bf1a63d82676f49/kaxisekusumenojazilanuju.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/b46f9c985ceeb7bccec213462a3fd228/gidupitikasenagalojaboviw.pdfIn PDF document text
    • http://keifo.ru/ckfinder/userfiles/files/dapobamolajeb.pdfIn PDF document text
    • http://americandeliorder.com/uploads/files/65188167439.pdfIn PDF document text
    • https://i-chat.tw/js/ckfinder/userfiles/files/56318836006.pdfIn PDF document text
    • http://mishelik.ru/userfiles/file/buxuragamoto.pdfIn PDF document text
    • http://studio-orlandini.com/userfiles/files/54281673709.pdfIn PDF document text
    • https://codecs.ro/images/file/supefo.pdfIn PDF document text
    • http://purifoy2020.com/clients/1/11/118d8b7ee1ea4bab8fb19da95c56260f/File/fazuzaxebesax.pdfIn PDF document text
    • https://thietbidiensino.vn/media/ftp/file/54195854497.pdfIn PDF document text
    • http://logtech.cz/foto/Image/file/guzekomuxubolelewuxovus.pdfIn PDF document text
    • http://kreativitaet-stadlhofer.at/global/images/userfiles/file/fugavawenadoxuk.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/wagibulutufebew.pdfIn PDF document text
    • http://italianopizzeria-pg.com/uploads/files/85646203822.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ade9b9bc6e1---14222154683.pdfIn PDF document text
    • https://hchoanglong.vn/userfiles/file/6796950371.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc3f2e5150---zaxexasupopidesunevatozo.pdfIn PDF document text
    • http://duocmyphamcongty.com/app/webroot/uploads/files/86959411194.pdfIn PDF document text
    • https://asiajitu.com/contents//files/41101924569.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_off0000c574.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC574 10592 bytes
SHA-256: a8c1f4f88423049ae163582516c63c00e785c52d81c34aa342af4e2c09a9a634
font_01_sfnt_off0000dda9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f5bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BB 17884 bytes
SHA-256: 069c4eebaef06cba6c80dbcbbd116fefd41f13c177a5e11e5c30f25fa2047011