Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6ff136e6d6f9a3f…

MALICIOUS

PDF

84.8 KB Created: 2021-06-30 05:54:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7fd0f28db9ad28a6834a86b79d87468d SHA-1: 746e258eb62ad84aaf9f3f8ffbf3a9133fb08bce SHA-256: e6ff136e6d6f9a3fcdc3df32ac600488a85525a229da4cadb6758832ba2910dd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the structure suggests it's designed to lure users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/a81ed7cf71fa716938069203affca723/24991246376.pdf In PDF document text
    • https://audit-advisers.com/userfiles/file/linajovasixefi.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6d6e86894---88657653561.pdfIn PDF document text
    • http://bronia.org/userfiles/file/sisukefumi.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/dcee90226589b1b3b2e5bb509f9eea39/10640903747.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160763f45404d0---girusigiletoled.pdfIn PDF document text
    • http://oilandgaswork.com/userfiles/file/36289551726.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/34727719816.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160962fe15d264---20940695340.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/49406329427.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/30732485534.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/98883737146.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/u26hsb2h7bqbfh8iot33ijlak0/pitanubefegedi.pdfIn PDF document text
    • http://zonweringnederland.com/ckfinder/userfiles/files/sonevamegovisa.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0a0aa226db---nukad.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/a4cf28f8dcd775ae3ea8bc3eff9181f8/61719080968.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/vgfhv9ep2hbfshfnrp7lgoh5vl/vebibasubekodibizobe.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607451f5337e7---48521220279.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/47868675291.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210630064550.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/75726658500.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4b2a34d9e---96991382213.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/7600607b7afac32f88fb8ab9a2aa32b9/kosategonuwosobewoso.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/37346145502.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=pnc+infra+share+pricePDF 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_off0000e75a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE75A 17956 bytes
SHA-256: 812c23e6cbadcb21c78c1076aab23f7d5de4f17ef99453e9579785ed836d834f
font_01_sfnt_off000116f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116F9 10312 bytes
SHA-256: 3dcada6d8b2cd09999bfbf4cb21cef232d8cc658e859849e113d11771c5e2164
font_02_sfnt_off00012e1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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