Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc34eb4dbd550584…

MALICIOUS

PDF

91.1 KB Created: 2021-06-06 12:17:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 914464ede9b5f0bac1e0f9207b987eb4 SHA-1: cd3aa3203610f76d5a67458c7545173863b33829 SHA-256: cc34eb4dbd55058450056c86b9aef70fcb8a6bcfb76d88840355e9fd4d6ef14a
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to compromised websites, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of external URIs and link farm heuristics indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://nomylo.ru/uplcv?utm_term=mckenzie+exercises+for+herniated+disc
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/9f044ebad336c41f9b13724d14e9abaf/87112961555.pdf
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/d92c583b39e81aca751e5f54502587a5/zoditul.pdf
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f57a7ac77---fakaroliragopulojejuka.pdf
    • https://atlastoursntravels.com/userfiles/file/mamaxarafidabuzigalosif.pdf
    • http://recrute.fr/files/files/55357715951.pdf
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160756fa0edbeb---tubulumonota.pdf
    • http://deurenhanger.nl/userfiles/file/16646940361.pdf
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/7b765c1659f51ee7af0b557903833c8f/terutazoxabebanatadisogax.pdf
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/8bcb0877495851a81d98f98d9ce0e865/zajujalejebinota.pdf
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/00d4e9d4ca41f95882f1e0ab5cd9eb3b/7833024618.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/oq3guos72v9q7arbg1o619qmu7/wawizuz.pdf
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/m171fvttenv95al2evibfkrans/duleritusedaze.pdf
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/42880712be39535bfe7e8137085e7ce9/11815104819.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b425ae3ef7a---27959329380.pdf
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/bgmm4t8bp251o19a78eepj2mp9/zidijure.pdf
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/71e52d1d297c54e51d72a3dd2c4ba3c6/nivewumenewur.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b240ec9a1b0---xofamufapamo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000126ff.bin
eb90948922f99c1ca5c4d8c0f42a3b1c0fe55cf3d95cc19efdcffd49acf1b0db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x126FF 5264 bytes
font_01_sfnt_off00013900.bin
1f737778ee056b4c275cc942be2acda9ce80df32fb3c13b79b64b0fc842dcd61		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13900 11740 bytes

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