Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4d42f46bbc91822…

MALICIOUS

PDF

84.2 KB Created: 2021-07-21 03:55:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8582e842ca2c978e7fac21da20d97ae5 SHA-1: 2f5f0536f6f1eac9356e9159e356c6a4e39b8799 SHA-256: c4d42f46bbc918224f671f26063f53fa3c6e89c072aa2c156e248cfffcde0f1c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to various websites, including those hosted on compromised CMS platforms. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 http://marymo.ru/uploads/files/powizazaj.pdf
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/6a36285ead8ffaabaca5133c641be7c5/82955685317.pdf
    • http://elyriahigh1974.org/clients/0/05/052ab20d644b737728595af1a47b4450/File/55104177638.pdf
    • https://dewalt-naradi.cz/media/upload/editor/file/19285649998.pdf
    • http://clubcrudupsonoma.com/clients/1/14/14cf715f5cd05ddba197ceaa5938d7d5/File/98404557815.pdf
    • http://huron81reunion.com/clients/f/fe/feec28e48c841af8be4ad6373737a022/File/66797462902.pdf
    • http://ducthoaudio.com/upload/files/43717807980.pdf
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075dbdf8a28c---19572102941.pdf
    • http://aksaaydinlatma.com/img/editor/image/file/17999217790.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d42dce6364---tuvegezofexapovozobopadog.pdf
    • https://bandotrading.it/uploads/file/78223083146.pdf
    • https://quatcongnghieput.com/uploads/files/vumelemuburedipevivele.pdf
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/34968559294.pdf
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/meaho66gmkfcebg1fvf5mrfsa6/vowokum.pdf
    • http://zavalinka.by/var/upload/file/nowizabuvozage.pdf
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e9feaf000---30052571558.pdf
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a588e25539---90943920142.pdf
    • http://fygl.net/uploads/file/04102740111.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609050ee2b18c---sawubodaji.pdf
    • http://gekon.net/userfiles/file/belofedebukat.pdf
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/e1i09kprqq6rmuvsb5r7h5cgd5/42965027789.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=play+subway+surfers+online+free+no+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_off0000e6b9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B9 16792 bytes
font_01_sfnt_off0000fecb.bin
9518ad1534973269fd91a6f392d5f26091137c16a1587e29099eb2f2724176c9
pdf-font-stream PDF embedded font (sfnt) at offset 0xFECB 16988 bytes
font_02_sfnt_off00012adb.bin
76586cc03132781dbe0e50eb052af05b00db79d6b82fd6e355b6ccda02155a63
pdf-font-stream PDF embedded font (sfnt) at offset 0x12ADB 10688 bytes