Malicious PDF — malware analysis report

Static analysis result for SHA-256 d585418dc4301188…

MALICIOUS

PDF

83.4 KB Created: 2021-09-07 02:47:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: df8efb67c409caee85f579882b24eab4 SHA-1: 541b81fe19d03fd7a6c27f51d2991d345cb50ef3 SHA-256: d585418dc43011886b2b2daf080d9facade959d18a6ec860fb6da5462001e462
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content or redirect to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://coretry.ru/uplcv?utm_term=tilda+doll+free+pattern+pdf PDF link annotation
    • https://nada70.org/userfiles/file/21482646300.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074b11256f19---pilofinevugigetadevuso.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/4itu1ci004cenf4ssk492r3e3f/fivipalefefojetos.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609aead3cfae9---45913548304.pdfIn PDF document text
    • https://prcomponents.com/ckfinder/userfiles/files/jaxirux.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/56115757592.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/72678996390.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bed27f705de---29866763121.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/514bokklnf55gdir1n1unhjjcd/30399281852.pdfIn PDF document text
    • http://zjhywt.com/images/upload/File/jexadofizevadewisojopi.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/21136839d8c6632edf2dd39e2abb7f6d/8488153835.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/7f844de5eb8a240db73434f27bb45382/36286957133.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/zexamif.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/t9a144p6gbq1l03o5aira0dngv/92725423907.pdfIn PDF document text
    • http://fiorenzuolatrack.it/userfiles/files/37216455009.pdfIn PDF document text
    • http://soleilboo.com/images/uploads/files/lubawalowasumogigulam.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080cd7b1b78f---jolinalawiwok.pdfIn PDF document text
    • http://galantemontagnana.it/ckfinder/userfiles/files/mirok.pdfIn PDF document text
    • http://cozycornerexpress.com/uploads/files/19537821546.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/xeragidag.pdfIn PDF document text
    • https://ms01bet.net/contents/files/gurawulitepoduxevebu.pdfIn PDF document text
    • http://krikrik.ru/uploads/ckfinder/files/89206625520.pdfIn PDF document text
    • http://sonnenheizungen.ch/fckeditor/editor/images/file/kipuf.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/gipodidopawagozur.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_off0000daf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF2 20324 bytes
SHA-256: f576d6dea9f36b14fa00ca04b685066d9484a3100e9d10b8945d59720b88874e
font_01_sfnt_off000110ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110BA 10288 bytes
SHA-256: 4d93d4ec3a57356844612be7be5df10eaf3d1c322123a26fcc480364d19e677e
font_02_sfnt_off000127eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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