Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec627764867e948d…

MALICIOUS

PDF

79.8 KB Created: 2021-09-12 04:20:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ab2aef3e305b86f0aedfa831fbb98b4a SHA-1: 4f28eb8e36c09b7aef9fac3bfedc33e6ac6a3d4e SHA-256: ec627764867e948d1d9a243b29c07d86da0072cafb0ed2117969f2b14390b992
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, indicating an attempt to host malicious content. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this phishing or malware distribution tactic. Although no scripts were explicitly extracted, the nature of the link farm and the ML/ClamAV detections point towards a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16133673b61cb6---bunamitarilatemow.pdf In PDF document text
    • http://testsitehq.com/ckeditor-ckfinder-integration/uploads/files/3046944135.pdfIn PDF document text
    • http://fbrasil.com/userfiles/file///vukobizojurogutukap.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/78079923020.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/gituxezawemo.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210911042349386362167.pdfIn PDF document text
    • http://lamorenj.com/userfiles/files/jofosawekiletineve.pdfIn PDF document text
    • http://balie.overeembv-profielen.nl/upload/files/vugasanelasasakuwutuxerip.pdfIn PDF document text
    • http://depcip.com/app/views/panel/ckfinder/userfiles/files/61393676532.pdfIn PDF document text
    • https://ethnicminorities.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/tosuzolusun.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/suditumab.pdfIn PDF document text
    • http://autoservizimensi.it/images/fck/file/41565334075.pdfIn PDF document text
    • http://diplomat2014.ru/ckfinder/userfiles/files/pobagegokovov.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b59a69ea56---68562110748.pdfIn PDF document text
    • https://natanashoes.com/kingkong/userfiles/files/wafopoxonogojefujebugebup.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210907020907.pdfIn PDF document text
    • http://kystar.net/filespath/files/20210907072513.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/8514507369.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/161378aaf8b90e---wanawuwi.pdfIn PDF document text
    • https://elearning-chemistry.ro/userfiles/file/90369202214.pdfIn PDF document text
    • https://westhygiene.hu/editor_up/negesujiwi.pdfIn PDF document text
    • http://npi-management.com/ressource/site-image/files/54986303021.pdfIn PDF document text
    • https://intersensor.ro/v2011/Files/fck_upload/file/12504991031.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=beauty+and+the+beast+book+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_off0000d295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD295 17964 bytes
SHA-256: fb1480421b151ae1b35348dc228c92adef884a4f8c970814b5a535183153a368
font_01_sfnt_off00010097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10097 10856 bytes
SHA-256: 80a3bb9a0d767aa5574ef4b13acde4b8d9142cdad749d50ee8d6f83659911758
font_02_sfnt_off00011973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11973 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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