Malicious PDF — malware analysis report

Static analysis result for SHA-256 f923e30b7cc84ea2…

MALICIOUS

PDF

150.4 KB Created: 2021-06-30 02:28:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 50aba87fa2916cc115dab788399a3925 SHA-1: ba5f9117fde1cb81e32aca7ee799e9ec832bd220 SHA-256: f923e30b7cc84ea2c36e3f1697ce07fac453d9cd483375e668be61d3d0cd84d3
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest an attempt to exploit user interaction through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9883

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://philabc.ru/uplcv?utm_term=meaning+of+sheol+in+the+bible PDF link annotation
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b431051f09e---55514023498.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb3dee4002---tanexaxoduwinazage.pdfIn PDF document text
    • http://congtyvima.com/images/Download/94391148956.pdfIn PDF document text
    • http://hk-dcc.com/wp-content/plugins/super-forms/uploads/php/files/11rlb5f9bc2uc4g088dj76teat/8644245610.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/wajejitej.pdfIn PDF document text
    • http://maytinhtuyenquang.com/home/maytinhtuy/domains/maytinhtuyenquang.com/public_html/images/file/89057342674.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1609881cbc29c4---xoroxozinosizolisom.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/84281125491.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609d787aa6806---gitikilolegefitobiwesib.pdfIn PDF document text
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/47dae59b20cfade6fd187969a6dcad65/67030894765.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/760b69d3960bf4b83f03a1cc1979ddf2/wufijasan.pdfIn PDF document text
    • http://montgomery71.com/clients/34132/File/sijiguwa.pdfIn PDF document text
    • http://skoleniridicu-online.eu/ckfinder/userfiles/files/6492046125.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/56235553018.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/15909979474.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e12659d03---sepazatoxagegelokupotu.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fea91cd358---26554376750.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f974e53a39---womofobifidinuf.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/tokitajitebazezefaxunazu.pdfIn PDF document text
    • https://alajuusa.ee/media/contents/file/fabovavabipa.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021052320244669.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/823le58pv7k2e0dfcj7fe14vd2/90230504871.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/majoseziko.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001c8a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C8A2 20584 bytes
SHA-256: c2d6f26c491f00a8a6e4ed53fef5177b56d0e28f3d769bec76052d83afb212fe
font_01_sfnt_off0001fb6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FB6B 19176 bytes
SHA-256: aaaaa5b7723f757f5e9fcc1876338a91376b5022193add703ba0dbe8232a6def
font_02_sfnt_off00021bc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21BC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000233dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x233DC 10524 bytes
SHA-256: b10a0940adf8c58a28a72b5b7493e55e3e0ceb4d171f13f8726a83b7188763e6

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