Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c67bde3d6a20855…

MALICIOUS

PDF

77.2 KB Created: 2021-09-01 23:55:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 693e2bddf66511fffa2b61bb269e07a1 SHA-1: 1d679f73924004c7b7e42dcb760a94bfcedc14ab SHA-256: 6c67bde3d6a208550aab41ed4bcaca30b6d6b97c41f29785c69acea88990bc93
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It functions as a link farm, with numerous URLs pointing to external sites, many of which are hosted on compromised WordPress installations or disposable domains. The primary purpose appears to be directing users to these external resources, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb4488e6fb---20560238424.pdf In PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b57f4e3320e---gesegisekuxido.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/pidusokozojofexijif.pdfIn PDF document text
    • http://veivel.com/userfiles/file/66541202655.pdfIn PDF document text
    • http://mrpennarak.com/user_file/file/54177601.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/1d53814729df64e5fbd2f437565b0c5c/rexurinovude.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087f4c38668f---2208173100.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/5o5khf4orl1fqanjbgdcggq0u2/86606931822.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a62ae50cc2e---sipaneruvavobute.pdfIn PDF document text
    • https://nusantarabet4d1.com/contents//files/640009145.pdfIn PDF document text
    • http://alrehabourhome.com/userfiles/files/88523731872.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/724868df0918af7cf3f8419ad1bce271/wifefosipitatu.pdfIn PDF document text
    • http://beta-rc.com/upload/files/49120605806.pdfIn PDF document text
    • http://wenyanchem.com/upload/files/gizomik.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/87757816044.pdfIn PDF document text
    • https://traicaygiasi.com/Images_upload/files/duvejuduluxalewuruzuwomut.pdfIn PDF document text
    • http://blueview.nl/app/webroot/files/userfiles/files/53803201494.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/27151808462.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/0385b86a567a1283ea9e05a90f981e63/xibezuzosikoxijeguduzikav.pdfIn PDF document text
    • https://khambenhxahoi115.com/images/files/rinutuwudajilavogusegezud.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/33322808463.pdfIn PDF document text
    • https://manualismedicina.hu/fileok/file/92660281381.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/74472271188.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=heart+of+the+valley+ymcaPDF 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_off0000c891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC891 17612 bytes
SHA-256: 0457b02dd8e0030b82e68477c9bfe59619305e74540efeaa3b6d5bf33615289c
font_01_sfnt_off0000f680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF680 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E97 10408 bytes
SHA-256: ebf3479a8a03fe12965eeaf6b6190eaed25b3dcea3f0058a1ebe85a5084ed649

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