Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dbe1de225acd22d…

MALICIOUS

PDF

140.1 KB Created: 2021-07-01 09:37:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 0a831a33932ee61c29ad4394c27bd264 SHA-1: 779767ebb9b5910c78149b407b9d975a3ea057cd SHA-256: 5dbe1de225acd22df5d1431eede54c822b5e05b16f736f84da8c60d9eada94a1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to numerous compromised WordPress sites and disposable hosting, likely intended to redirect users to malicious content or download further payloads. The presence of embedded URLs and the nature of the heuristics suggest an attempt to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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 https://wastran.ru/uplcv?utm_term=watch+the+lord+of+the+rings+the+fellowship+of+the+ring+extended+edition PDF link annotation
    • https://scriptdd.com/_file/file/43911960317.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c44ad063e34---51327712181.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16087c2895d18a---61938622053.pdfIn PDF document text
    • https://hoakhanh.vn/uploads/image/files/36524644487.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160db8e4852c0f---muselesodorinosewujawaso.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/55827499921.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16075c57e93640---58895246614.pdfIn PDF document text
    • http://bjjiffy.com/upload/10649007986.pdfIn PDF document text
    • http://paolacaone.eu/userfiles/files/56466531093.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/rerikuxugidesobalufixosez.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/390u72o2l7qbv2i0u0jcf5eac2/42454843446.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/f95db194b35e5a48df85c5aa7196a8f9/xarixexuxavimipenudex.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d27a0c73c9---jizobowavofasupadu.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/ledamegezowo.pdfIn PDF document text
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/48901468831.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e7ea43082---fusemapixijewokubuterezat.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/ilsse793t7v8stibtjv77rp2s1/zigofefafaf.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/2995801262.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/b9e24b5ffde08a3f3a6b8f226d04708c/67515245004.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/i2inakjvkd95bepk07tspubiq0/12238604697.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/g7s8b39132j1bmjsg6s34gfhsn/76309336938.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6967a20708---veroxopupabowevazijevibak.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/0lmb725dm0lncl3tti764ppg05/37921673275.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160992f037d7cf---bilovokokikodurojevir.pdfIn PDF document text
    • 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_off0001bd51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BD51 11080 bytes
SHA-256: 26de5f698a93187d630987b3670889b337ef3fcd5f56fcf04fe5b1d2b7fbda2a
font_01_sfnt_off0001d6f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D6F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001ef07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EF07 18908 bytes
SHA-256: 1b83f6f9562cd31ba0a61d77907f09963841262e50ea7fdfdc008db95f6c8955

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