Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd72e2f743f40f4d…

MALICIOUS

PDF

78.8 KB Created: 2021-09-08 20:55:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 19ae737ec160517e233cfcd306d43f18 SHA-1: 05ddbaad15d0ed39df6e7744fc0ee14ec6186f4b SHA-256: fd72e2f743f40f4d5b4c9efbba3c92747d76a472e026af0560bc1ff5bd9c1e0b
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains numerous links to external resources, many of which are hosted on compromised WordPress sites or disposable domains, suggesting an attempt to distribute malware. The presence of a visual download button further supports this, indicating a lure for users to download a malicious payload. ClamAV detection and ML classification confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://huntic.ru/uplcv?utm_term=communist+manifesto+in+tamil+pdf+download PDF link annotation
    • https://menokatea.in/ckfinder/userfiles/files/wefurekusuxever.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/3fb57facic4meo43r7gajdj5r6/57796695030.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa91dd24d7---xigetilafenawigisisa.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/49702432477.pdfIn PDF document text
    • http://viethanit.vn/hinhanh/file/dimazekagoz.pdfIn PDF document text
    • http://swancentive.com/cote_dor_import/admin/ckfinder/userfiles/files/5060176914.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/tv5kp3roacop45av5sq8ccdjv5/bobikarikiniwiwi.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/84cd371942b80a19620cccf1cb0ed36d/20055094993.pdfIn PDF document text
    • http://sdv.sk/userfiles/articles/file/85004431721.pdfIn PDF document text
    • https://asesoriagade.com/app/webroot/files/files/15865538814.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/vewewozimemugewuxi.pdfIn PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/84284586005.pdfIn PDF document text
    • https://lmcmanager.com/ckfinder/userfiles/files/19215599403.pdfIn PDF document text
    • http://munsusa.org/userfiles/file/20210905121520.pdfIn PDF document text
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/363921581.pdfIn PDF document text
    • https://fuze-pay.com/ckfinder/userfiles/files/kitoxe.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16130d9f16568e---nabefototupawalotovolokut.pdfIn PDF document text
    • http://raczcsalad.hu/files/18204177836.pdfIn PDF document text
    • https://cakenflowersonline.com/userfiles/file/rejikurulokazigi.pdfIn PDF document text
    • https://negaratoto.com/contents/files/totejewovig.pdfIn PDF document text
    • http://aasghsflqsae.handylover.com/upload/files/90983997869.pdfIn PDF document text
    • http://the100voicesofgospel.ch/fichiers/newsletter/file/74932562580.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_off0000c5f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE08 20188 bytes
SHA-256: f978fb6e33ce4738afaec14269a206c5f5e66cc83741d8cb1e347479bbf87e5b
font_02_sfnt_off000112dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112DD 10776 bytes
SHA-256: 81f6840464a283d8b80e5b12d11cd5e4d14a814deee9deb23d47d8add502ee16

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