Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb9fc2af2e8530d6…

MALICIOUS

PDF

65.8 KB Created: 2021-06-13 20:30:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1f1d010a076daa5546572625865b31f8 SHA-1: ffb6bfd3548dbdf9953a44b7f54232ece81ed950 SHA-256: bb9fc2af2e8530d6a8a9a5a24050da4ed89de231398ae392d404aca6a18494c6
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to various websites, many of which appear to be compromised WordPress installations used for hosting PDF files. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of external URIs and link farms strongly suggests an attack pattern focused on redirecting users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://garglob.ru/uplcv?utm_term=the+multiplicative+inverse
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/502jeufs99c4msbrjhkn5r9aqe/77744981996.pdf
    • https://daaeportrett.no/upload/file/busagapepesokapuwuwi.pdf
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/o74so93je76olhrjvpckp7s3f6/60680237151.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4d4d91440---pavoxukura.pdf
    • https://zlatartopalovic.rs//files/zupiwape.pdf
    • https://mmszke.hu/files/file/wudojibozika.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a404bb501a9---fumarovujavekopeberujo.pdf
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160961c959da7e---xobivutimapitaxekele.pdf
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/912494ba20be10ef15726a6c9c6728b9/23488084228.pdf
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/cldrh53u1721m3ddvfgoeicb63/52992240668.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607034317cf44---90789310584.pdf
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/7d1d37a209dffbaea40d51ca619e5d47/zinerumalofeda.pdf
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/ea521b236c07d24d4ed63d45be3a1077/57956321563.pdf
    • http://sns.hu/_user/file/26810432570.pdf
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160908c6dedfd6---vaderot.pdf
    • http://studiolegalezullo.eu/userfiles/files/gujulim.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_off0000c65d.bin
1e3ef195fde53c434861ba03057773f2fa219be4c2fb947ef29187145282652a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC65D 5180 bytes
font_01_sfnt_off0000d7d6.bin
50fc26020dd784ce456c01dd85c20e128b5c3c394eeea0c7a3b2a28bd0f71e86		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D6 10028 bytes

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