Malicious PDF — malware analysis report

Static analysis result for SHA-256 77e1ec346dea51c2…

MALICIOUS

PDF

77.0 KB Created: 2021-09-07 11:56:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: bd4154ffdf5733be08bb02dd3dbd3377 SHA-1: c0f6c2f5fdf70e3f70f1b818d2b1b58acb6a411e SHA-256: 77e1ec346dea51c2bb03bba08c322e858e6a3bcce066a5e49c92aa4adc9d8219
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or initiating further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://architettobotteonpierpaolostudioabacus.it/userfiles/files/86995144203.pdf In PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d711add1f---tugofutotobidizedalos.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/butisodugozis.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608aed68a2383---kolejodagizomonupijeg.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/49843452005.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/b5e5ab6dfe28f11d6e753ca448bae08d/43651022980.pdfIn PDF document text
    • https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/zulatixilazomafitune.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/9efaa3f8949584085d331f3f70801b1b/36432916331.pdfIn PDF document text
    • https://airshow-bg.com/file/84875842490.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/220c9da0e8a2d0ebab472cc95edea78b/lazagadivepaso.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///95372697138.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/xodadizitusuxo.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/55061126052.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/e7832382180a8164366ebd009b32e7eb/24268898208.pdfIn PDF document text
    • http://xn--b1agaa2anfqdp.xn--p1ai/ckfinder/userfiles/files/niweputigefelifidizud.pdfIn PDF document text
    • http://digifast.cz/userfiles/72865000933.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/ansuimf0lbg2uavb938gm6n9pe/15703433473.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16107a9beba777---2477431905.pdfIn PDF document text
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/73495ce97d38f9bd088e242ea94ec520/zovesesekemefutotinegoru.pdfIn PDF document text
    • http://klinok-saintp.ru/files/46371775147.pdfIn PDF document text
    • https://history.tlshaa.org.tw/ckfinder/userfiles/files/gijiwezisigifozuruzulozu.pdfIn PDF document text
    • http://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/gekigojosagubefikobupok.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/xavif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=atomic+fluorescence+spectroscopy+instrumentation+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_off0000c878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC878 16744 bytes
SHA-256: f637efdf57e8eaa699acf792d61b9b72ed94b1c598c36c17e45949ea1e3297f7
font_01_sfnt_off0000f45a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C71 10976 bytes
SHA-256: 4fdf4e8a9d3ad1aebb97b77327c661c9223dfe7d719f38ab13289692663f124c

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