Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1acf6a23f615f49…

MALICIOUS

PDF

86.0 KB Created: 2021-07-03 10:37:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e52ea7a32a2ef5faa7b3105fc6b9e155 SHA-1: d577e6662a274d21c515e449a6f6adf92939df31 SHA-256: c1acf6a23f615f490e7f234aac41c8e82b4d26496a8af14a6d9cb9713f4a08a3
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised WordPress upload directories, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and unreadable, but the presence of external links and the heuristic firings are sufficient to determine its likely purpose.

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 https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/b70b7a374bbf3884919a4f5acb9aa620/tefufegodiwafovowosuwi.pdf In PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dcd628102f---fizizo.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/butedefovinifusufet.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c92d25b0a98---metokix.pdfIn PDF document text
    • http://kientrucnhacuagio.com/upload/files/80679441019.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/bca6f728fe0bcebbcb1deca5a960260f/tupujiximererisixixi.pdfIn PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/tepal.pdfIn PDF document text
    • http://cedule-plachty.cz/files/file/55929808543.pdfIn PDF document text
    • https://xn--fiqa735be48e.com/upload/files/77691110968.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c12c7509c2---31375368038.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/dfa6c7304e3f165a38a666e63d541e9e/31025124132.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/8005925432.pdfIn PDF document text
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/5378326430.pdfIn PDF document text
    • https://fwullong.com/upfiles/editor/files/wowizigeziwigirun.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/ci58v2c3q3i7qonmegtfinjef4/62687735053.pdfIn PDF document text
    • http://jinanxintiandi.com/userfiles/files/97281169146.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607b039ba55f0---ligad.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/xuwuzumalodadozuti.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/36134744852.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/hmg1gbklu25fp7mjtrripjic0v/fatopajava.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b15bc77dbc---15154107682.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=draw+the+human+heart+and+label+the+partsPDF 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_off0000f110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF110 10772 bytes
SHA-256: 8e1959230c3f251ce6a0b1f9fa2cd6e83215d47239cf1a6e1dd05788184194b7
font_01_sfnt_off0001097e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1097E 16100 bytes
SHA-256: 8ad8e5dd3e357de2cd35c9cbec097566a0f2f0d981111da72ef7c39e175294b2
font_02_sfnt_off000132d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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