Malicious PDF — malware analysis report

Static analysis result for SHA-256 b19762bda04c1c4c…

MALICIOUS

PDF

74.8 KB Created: 2021-07-02 07:23:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f39b3e27a5db7aecb5b06d06c20e4f88 SHA-1: 0350e34f85967b23388437a83689e500c166f9f8 SHA-256: b19762bda04c1c4cbe3f6d726eec72c7034d6e921baf1fbdbfaf17be43fa8153
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised CMS upload directories, suggesting it's designed as a link farm to distribute further malicious content or phish users. The presence of embedded URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a deliberate attempt to create a deceptive web presence. No scripts were extracted, but the overall structure points to a malicious document delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d926c9750c3---xatijaxe.pdf
    • http://vce34.ru/attachments/file/mepupofedavuwafipetobi.pdf
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/vsea72damd2t5r3sp8qrj0sgj2/raruso.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee0e1215e3---bidorivifelo.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608d86bb6e110---22892043263.pdf
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/6c2283a3522badfec828e3b79ddbf89a/46781103182.pdf
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/35e33a89c09dc6f4a6dc4a8670e64e7b/tasejivixavoji.pdf
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/f2658d0ca91cb50ec23722e7255d5705/zezusetokefegolavelala.pdf
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/48ractcsmta3cp5tnb1o3k09h2/kijexelodeletifolamubani.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/469241119ed1c038f982c1b399694a6f/36714659214.pdf
    • http://abwlanham.com/uploads/files/mujuwewevavalusiz.pdf
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607758ff2f3df---51879854255.pdf
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/202a70d20b0cf16aabd8c5f2c85cbe34/43113518390.pdf
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/acfe34303b8819aef6bc7c223311d155/joladam.pdf
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/1fg795d2v8vjpmbu6smtdgb3f4/finilupumita.pdf
    • https://tiguan-wiki.ru/file/vupobekazigamotojutibup.pdf
    • http://mldinsaat.com/image/files/zopuzipak.pdf
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5b2bdb964---mefed.pdf
    • http://longarmacademy.net/fckeditor/userfiles/file/verodatibel.pdf
    • http://kingbikeonline.com/images/upload/File/rawibonejopevufik.pdf
    • https://bancodevida.com/bancodevida/admin/images/image/file/49376916006.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5a4be6af5---tisimofefafitukirobanup.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=tales+of+symphonia+gamecube+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c044.bin
265f4cb7b52984d4d1eb9230ad8ac31010b2082b85333bea4ffb0502446bbee2
pdf-font-stream PDF embedded font (sfnt) at offset 0xC044 11272 bytes
font_01_sfnt_off0000da2f.bin
cf272740c348a69c99f4b16aa28faf0bd9e02ab67b242e48a528c0c25058fd95
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA2F 16740 bytes
font_02_sfnt_off000105ed.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x105ED 16792 bytes