Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1951c5cdfc12eba…

MALICIOUS

PDF

80.7 KB Created: 2021-09-17 22:12:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a6adc0f13d7f992b339ff1313b53ee1e SHA-1: 77c626264470b0db7e0d2ff45ada842decca05e0 SHA-256: f1951c5cdfc12eba130128c2566385aefd9d1ef7eae4f7a52313d02240d142c3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall detection indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://pixomot.ru/uplcv?utm_term=j106h+firmware+download PDF link annotation
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/676d31a094be0efbda4f8d8ef3cde566/xuxotozoza.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/75c3391c3ac14678630944089aae6a29/69241855295.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/90118560957.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614276f9462ea---8190126714.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/wonifimiminozevaw.pdfIn PDF document text
    • http://ourdesign.hk/ckfinder/userfiles/files/filowutelixido.pdfIn PDF document text
    • http://www.veslovani-vsb.cz/soubory/file/mosegevalubozevu.pdfIn PDF document text
    • http://105chers.netsociality.com/upload/files/34821368359.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/161411c2ae7acf---pesimupugoxebejaximusiwu.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0b362cbd8---22631703769.pdfIn PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/gebotujapil.pdfIn PDF document text
    • https://glearningsolutions.com/userfiles/files/63592173269.pdfIn PDF document text
    • https://uleshuzatabc.hu/files/file/malomazodurizagofi.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/14608898077.pdfIn PDF document text
    • https://eletmodguru.hu/files/files/boxuxovuji.pdfIn PDF document text
    • http://vsrru.ru/userfiles/file/zosivutazuxuxosomirof.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/43011163437.pdfIn PDF document text
    • http://sieuthicayxanh.vn/webroot/img/files/99406301815.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/godabodimebamogopojumux.pdfIn PDF document text
    • http://3qlohas.com/CKEdit/upload/files/59062731623.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161434a785ca97---75351820037.pdfIn PDF document text
    • http://misterholidaysanprisco.it/userfiles/files/5027531941.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_off0000d509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD509 10772 bytes
SHA-256: 02001cf10cc91565b915a4fa7fd055a6435e5c849d0a35504efa579ae2cda45a
font_01_sfnt_off0000edba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105CC 18428 bytes
SHA-256: e809c50cb9aef298cec4c2a01650cd7da804f3f90725e6497e4c36bde98c069c

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