Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ff756cc51aa639d…

MALICIOUS

PDF

81.5 KB Created: 2021-09-04 01:24:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a4316c79638c7c423dd6ea7553ef8c8f SHA-1: 6fd90a43cefbea769ef65ae88fd736a95a106e6b SHA-256: 0ff756cc51aa639de4ce4b16f740b423d21b3cefdb368e94e94ecb33bc15b16d
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary function appears to be acting as a link farm to distribute traffic to potentially malicious sites, likely for phishing or malware delivery.

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://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160733b889a634---zuruwawiruzi.pdf In PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609684667083e---96525749253.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/79024708813.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f76597629d---gepupizelojisubiwowos.pdfIn PDF document text
    • https://childconcern.in/trila/userfiles/file/48230739580.pdfIn PDF document text
    • http://beijinghuojia.cn/userfiles/file/jetajixal.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/19810000152.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160729f1fbee07---89713007819.pdfIn PDF document text
    • http://liyangah.com/Upload/file/47298592389.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607f78a34ee33---28752746100.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/2paqrtu27mtslq0hlbm5t6cf73/tivaxolumewimujozuvudaruw.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/36482064459.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/bd64alstva82kee9on7dn6km3g/28391373842.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0ac5e11fbc---kevejif.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7656919dc---kujufaxobudakedu.pdfIn PDF document text
    • https://profix.fr/ckfinder/userfiles/files/91868368602.pdfIn PDF document text
    • http://sy-smile.com/upload/files/zululegekatugegafebivez.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/fexonojoburepiwe.pdfIn PDF document text
    • https://afayl.com/userfiles/file/78797055981.pdfIn PDF document text
    • http://carlaschroyen.com/content_docs/36226122806.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160869cbed91e1---zuwofusaxapixowefanowege.pdfIn PDF document text
    • https://livonija.admark.lv/sites/livonija/uploads/documents/files/36063988491.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=brown+girl+dreaming+jacqueline+woodson+pdfPDF link annotation
    • 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_off0000d936.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD936 17548 bytes
SHA-256: 9b3fd71f3d65bc2b89f9e9784d842333d5f25f7c24ae770c912532f75fa54141
font_01_sfnt_off00010640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10640 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E57 11380 bytes
SHA-256: ff448113ed8f024811f1d856edbafe68e235418336212a111088904c939e7f1c

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