Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc4f362879b67ae7…

MALICIOUS

PDF

76.2 KB Created: 2021-09-16 02:46:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e775f1923f3579f848323ca0a3ae39f6 SHA-1: 4598868a43687bc64ab65626163247beca28f41e SHA-256: dc4f362879b67ae7b96350137238b957fa5ff925d4d5ae6f715548d418a1835a
196 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or malware distribution campaign. It contains a link farm pointing to multiple domains, some of which are hosted on compromised CMS uploads, suggesting an attempt to obscure the true destination. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document may instruct the user to open a password-protected archive, a common tactic to bypass gateway security.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8acb0f40c---wumuxanizutusekabuvoze.pdf In PDF document text
    • http://www.siposferenc.hu/html/naboni.pdfIn PDF document text
    • http://galettedesrois.eu/userfiles/file/12528969347.pdfIn PDF document text
    • http://pretaporter-pegah.com/userfiles/file/dezevixakotuponod.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/dabotuwafuteporetigojewer.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210916022835804.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/69190382199.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133216cbe786---fisodod.pdfIn PDF document text
    • http://domoticasociale.it/immaginiNewsletter/file/30809765643.pdfIn PDF document text
    • http://bipaf.org/2009_home/upload/editor/file/segavofeta.pdfIn PDF document text
    • http://isleford.com/filespath/files/20210906054244.pdfIn PDF document text
    • http://vo23.ru/upload/file/20854159464.pdfIn PDF document text
    • https://projectmine.hu/ckfinder/userfiles/files/fatemora.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/nikudutagopegitifemowakif.pdfIn PDF document text
    • https://supermagnum-bg.com/userfiles/file/worokarudonosatow.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/161408ff91fd7f---malusakimijizixu.pdfIn PDF document text
    • https://ezokniga.com/uploads/file/77016706198.pdfIn PDF document text
    • http://espressobuilders.com/app/webroot/files/userfiles/files/11737235572.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/aee92a71f20dd7ea2fa46bdc037cb26b/japuzejivadunumu.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef37fd0ec5---10329396581.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c895676a80---fotutuwusiruvefisupenu.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/87004895878.pdfIn PDF document text
    • http://solo-reisen.com/media/images/file/15275554848.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/70159420544.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=empire+at+war+forces+of+corruption+trainerPDF 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_off0000c05c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC05C 10764 bytes
SHA-256: 78b23eeaf93bb969efd0706a4ae648ed6199c02f6f381bfb276e0340383a7ace
font_01_sfnt_off0000d931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD931 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF143 19124 bytes
SHA-256: 9b0e2aa78c2dc8126a0aca79ed910ecd3a222f948b1b6dede7911c5700b763eb

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