Malicious PDF — malware analysis report

Static analysis result for SHA-256 de77880861afd8cb…

MALICIOUS

PDF

73.6 KB Created: 2021-09-18 00:55:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d0504093c9b564761d8b4af3726c37e7 SHA-1: cfe20c3d7f58704de04becdb31f81567ad828bb1 SHA-256: de77880861afd8cbc52b8271f4b73d54ef1fe009d57875bc8a3d991259b50a0a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is often used to redirect users to malicious websites. Several heuristics indicate the document functions as a link farm, with many URLs pointing to compromised or disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://land89.com/ckupload/files/livep.pdf In PDF document text
    • http://swancentive.com/cote_dor_import/admin/ckfinder/userfiles/files/37101625658.pdfIn PDF document text
    • http://www.letnifestiwal.pl/ckfinder/userfiles/files/tezudasi.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d98f74dfa3---pomamina.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16136b8015c422---nakenijukaxiden.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-15/20210915140122626152.pdfIn PDF document text
    • http://thesprotia.gr/uploads/file/55076428079.pdfIn PDF document text
    • https://km2804.com/ckupload/files/11127181220.pdfIn PDF document text
    • http://studiofelician.com/userfiles/files/wisobak.pdfIn PDF document text
    • http://yeditepegumruk.com/userfiles/nozuzasufalodogefune.pdfIn PDF document text
    • https://darkoyunpin.com/calisma2/files/uploads/1644334801.pdfIn PDF document text
    • https://megatekspb.ru/sites/default/files/uploads/nebutinakok.pdfIn PDF document text
    • http://regalmotors-jp.com/js/upload/files/4289080179.pdfIn PDF document text
    • https://architektor.ru/uploads/file/19340439971.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202109050036307731.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/wuwojobulig.pdfIn PDF document text
    • https://jpt.mysmartedu.com/uploadimages/files/16456835155.pdfIn PDF document text
    • http://immobilieninvestors.org/userfiles/file/bolijiwobewizi.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/42e04949a09cdbe12a6e76767a210e95/12456544372.pdfIn PDF document text
    • http://a-b-i-s.net/layout/bilder/file/giwoladifetejo.pdfIn PDF document text
    • http://dzstock.com/Upfiles/file/gowujugotumusazu.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c4a80d8682---voforuripevakozus.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613273f70c1ff---68279608622.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=apk+means+in+androidPDF 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_off0000bee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEE5 16360 bytes
SHA-256: a5dda233f829626e939a5df1a639fd517f646534ca63a131e1c7f99dd1d6d92a
font_01_sfnt_off0000e92c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE92C 10484 bytes
SHA-256: 1510ccfd65998a64561164baa286011238e58a58da984b6a10e2dbf6f8bc8184
font_02_sfnt_off000100f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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