Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ac5f4df6714c443…

MALICIOUS

PDF

107.9 KB Created: 2021-09-01 11:23:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: a7d950193c2bfac6cc973eb88dc9f82f SHA-1: 309d93f6065d48efb2c721a043baf40adc0c00a2 SHA-256: 1ac5f4df6714c443718e992f749d1feb45df25568338aaa903bc8d95d102a7a5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of many external links strongly implies redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://krisoc.ru/uplcv?utm_term=definition+of+urban+tourism PDF link annotation
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0cdc150f206c3109e7a10d6e5a954fd8/44816514532.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/2e86debgkn8h0mfmjq73kgglhn/40704439896.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160f5cf7543e8b---lukoges.pdfIn PDF document text
    • http://whatdwellswithin.com/file/vorivevuwemowaw.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/09b8ac24fb386c0f67bf3d2434757cb3/30848297128.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/siguxapi.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090714528f58---denuguzeposa.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160d376d761efc---80201331793.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e43e19df7---rimufuxosuw.pdfIn PDF document text
    • http://woorymart.com/userData/board/file/40643058576.pdfIn PDF document text
    • http://bongoes62.dk/userfiles/file/63708488241.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/16098bd0b756c0---fujifiretipes.pdfIn PDF document text
    • http://ypperfect.com/ckfinder/userfiles/files/33772632660.pdfIn PDF document text
    • http://3qbuy.com/CKEdit/upload/files/fovagamike.pdfIn PDF document text
    • https://plasy.com/uploads/file/78051095729.pdfIn PDF document text
    • http://runningrhinelanderrabbitry.com/clients/875187/File/60639872269.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/bf3991ae8af0e0b53e747ec9a291cd45/wizesupenutikitili.pdfIn PDF document text
    • http://mppscstudy.com/admin/usercontent/file/65188458818.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/4e36146289905a9e28f1d8dd0f72f744/5448825692.pdfIn PDF document text
    • http://0851gay.org/userfiles/202107file/2021070504295270554.pdfIn PDF document text
    • https://fortworthdental.net/cmsCart/upload/file/16486981123.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/nidekenozorojonegu.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/50868041786.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013a79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001528b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1528B 21416 bytes
SHA-256: 420b10f4c2f245b59fe2954360525efae080e77f90e7aaaa10ab14dd35115b7e
font_02_sfnt_off000189e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x189E9 10568 bytes
SHA-256: 6daa52b77ea0b5a536d22098148f14491d29b1d2bdc542af3b230e20b9a5a7e9

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