Malicious PDF — malware analysis report

Static analysis result for SHA-256 a83f8fe0dfd241cc…

MALICIOUS

PDF

84.5 KB Created: 2021-06-16 10:33:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9a33fc446afdd35ab5a83744ac5ee221 SHA-1: adff50911eab281ec6ba4d54ba87985753aa72e4 SHA-256: a83f8fe0dfd241cc140f9c82a68780a179c7b960e18692d6b6409f6716a8e025
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations, suggesting a phishing or malware distribution scheme. The presence of a link farm and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing lure.

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://irlanc.ru/uplcv?utm_term=pretty+little+liars+season+7+download+free
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160760c0a3a030---dejagijufidagefixej.pdf
    • https://aawyx.com/sites/default/imageuser/file/5025776888.pdf
    • https://ludifrance.fr/userfiles/file/4741152401.pdf
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/32e3fbd2e1159fc78d6063260ba2622b/jepejajifagurusirevap.pdf
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c95422cf35f---genotuvibokajixokaj.pdf
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/a92cafc7180c6f9809d8e7f2ee2a1ab2/rilapibidodibibakowop.pdf
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160820b3b5ff67---daneguwapilexonagiz.pdf
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/81e6e46024fcb6fdb4580bebad30ab34/tesumolizomom.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a6188a3c1---29581709177.pdf
    • http://rolmech-strzelno.pl/Upload/file/5333104829.pdf
    • https://suma.ca/upload/editor/file/53994769271.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/v1qlbqh3b6u1golcr2u9sip3e5/15791496706.pdf
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606dcf7870454---vukulom.pdf
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/d695adcc508a2e8f9225f501d3f56932/ruludifavufis.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e040a03c2c---7412697447.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_off00010c0d.bin
00e878dbfb36c4810e8ee871a03121c3d20c8a090ef1d347fd4f8bb884b1643a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C0D 5176 bytes
font_01_sfnt_off00011dd7.bin
7328c3fa9e94c8c65148339e14cafcded7b75e665f0722a36d88a416b6ae3391		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD7 11056 bytes

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