Malicious PDF — malware analysis report

Static analysis result for SHA-256 350ebec385217392…

MALICIOUS

PDF

82.4 KB Created: 2021-09-17 21:16:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7f373b27e11d90e11bf9674caf47d170 SHA-1: 1ee0f4ade0b5cc234068100829583d861359fa1b SHA-256: 350ebec3852173923037daabe5df62c71799513bd5812ddcecede341ba647ab4
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple links pointing to external resources, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 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.
  • 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://happyland-nsk.net/ckfinder/userfiles/files/vedatobotivubulolinim.pdf In PDF document text
    • http://commune-bourre.com/userfiles/file/97305881098.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe8af0667a---94645991121.pdfIn PDF document text
    • http://royalrep.com/userfiles/files/65540659377.pdfIn PDF document text
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/93168701454.pdfIn PDF document text
    • https://fetogram.com/images/upload/files/tonew.pdfIn PDF document text
    • https://majubesar.org/contents/files/68644412685.pdfIn PDF document text
    • http://iccjsc.vn/images/uploads/files/38319964073.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/h7e8rmek29b6d46ks1qfff2p05/64696534812.pdfIn PDF document text
    • https://stephan-kratt.de/data/reiterhof/userfiles/file/mulepum.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/kesedaxevopezufomonok.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/nowubimuv.pdfIn PDF document text
    • http://wwstationery.com/files/file/71722242510.pdfIn PDF document text
    • http://cainghienbinhduong.com/uploads/userfiles/file/wawetaxeru.pdfIn PDF document text
    • http://mebel-moscow.com/content/xuploadimages/file/ruwugovanupabotezoli.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/a1cf95e17716dfc5f4d5419b028e6ba3/tigazugidafubiwamikuxaj.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/nozolasolevifobarejade.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140a284bc31b---18665348861.pdfIn PDF document text
    • http://www.siposferenc.hu/html/51847481753.pdfIn PDF document text
    • http://zbigniewrodak.pl/galeria/file/24559094565.pdfIn PDF document text
    • http://bangladeshceramicsociety.com/uploads/editor/files/refopevupuvivebokedenow.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/41078724278.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=android+6+zip+file+downloadPDF 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_off0000dadb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDADB 10520 bytes
SHA-256: 0146c40c898489a6c54aca144230e836d82969ad168191fa09f62bb04fe98da7
font_01_sfnt_off0000f2fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FE 18592 bytes
SHA-256: 542a699ab8d2cde92cc3d6894c24cca46eb21aa49bf8a425785fe596be3b0a1c
font_02_sfnt_off000123b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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