Malicious PDF — malware analysis report

Static analysis result for SHA-256 968366dc77ef4c22…

MALICIOUS

PDF

81.0 KB Created: 2021-09-16 01:48:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b913e4027282754df31cbf3241e0e5fe SHA-1: be78167dbb4da1621986716c97f66e225e78c8cc SHA-256: 968366dc77ef4c2203a7da712de841520e533580f5b0778c8b29945a175a6899
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to websites hosted on compromised CMS platforms or utilize disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://www.cerel.eu/images/wyswig_images/file/16823605248.pdf In PDF document text
    • https://alstar.uz/images/shared/file/86757334966.pdfIn PDF document text
    • http://dasbluemchen.com/papir.pdfIn PDF document text
    • http://doudou.tw/userfiles/files/rulizenagimojixip.pdfIn PDF document text
    • http://efcosmetic.com/uploadfile/files/kexunudixulijimunadusuziz.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/19ee74b9fc1865bcf8f8cb4ebc3ce950/kutopafavesukuvenawupeg.pdfIn PDF document text
    • http://simsvizag.com/admin/uploadedfiles/file///14440756692.pdfIn PDF document text
    • http://odontoflash.eu/userfiles/files/65885022808.pdfIn PDF document text
    • https://value.ae/userfiles/file/pobafijulibebiromukubu.pdfIn PDF document text
    • https://nangluongvada.com/uploads/files/dejexonewufe.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/3ab93eba36a868610b687cced74f018d/kolegukifo.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16141f43fb9654---46266994790.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/94741855319.pdfIn PDF document text
    • http://janjoling.com/public/ckfinder/userfiles/files/bovova.pdfIn PDF document text
    • https://viceda.com/userfiles/file/17665356784.pdfIn PDF document text
    • http://patroha.hu/file/sudejutifij.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/16137eba5f1402---sotokutemij.pdfIn PDF document text
    • http://eternoohydro.com/d/files/pifateludaxerapimidi.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ecd9eee21e---vilosexisebubi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141f75cd6522---vekebepivijurinebulesab.pdfIn PDF document text
    • http://93564497.com/userfiles/tufaweverat.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/11131882532.pdfIn PDF document text
    • https://curvy.tw/upload/files/2239017268.pdfIn PDF document text
    • http://www.taxivanclass.com/uploads/ckfinder/files/77351667153.pdfIn PDF document text
    • https://jamuiboe.com/webroot/upload_media/23875115107.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+find+ip+address+of+my+android+phonePDF 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_off0000d997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD997 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A9 16472 bytes
SHA-256: 12e6e2d04f636703992c1332b16ed35ea8556297a6ca8335c08a33ac65ae743c
font_02_sfnt_off00011c62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C62 10908 bytes
SHA-256: f81c8ca74db43696b0a6e4a12bdfa07a519365df1241675e3d5fe412d17c6943

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