Malicious PDF — malware analysis report

Static analysis result for SHA-256 eea28b7caf88821a…

MALICIOUS

PDF

88.7 KB Created: 2021-06-28 19:55:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 79aa586753e95b4630bc31a86a13cc40 SHA-1: 2b8e50f25b62e60cb5a271f823d8e3915a71c6de SHA-256: eea28b7caf88821a8fe03de4c0a9792122c36218c43d282db51a936ad4778b7c
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is identified as a link farm, with many links pointing to compromised WordPress upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://infrive.ru/uplcv?utm_term=how+to+pronounce+days+of+the+week PDF link annotation
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607559c426129---91736226630.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/a04402aed31f711fc5db368988a1d9f5/96513426692.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/eae751a9b369c3f3ce2bac76be4bef92/nidagabumavinidivev.pdfIn PDF document text
    • https://webmenuplus.com/images/file/39069875951.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077e7bca6d23---tejusiwa.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/ead62ca6718a472f283da0f56779d566/xerejonowipijusedawo.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/wokupew.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/99f78fe96b9030d7299b54999ce5ac7d/bitalasodurozuromusevo.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cf4c4b9e620---59903726617.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/98c339468a7371f7b7e6bd5793f442fe/61741186763.pdfIn PDF document text
    • http://imreelectric.sk/uploads/file/jugojenupejijupagabeje.pdfIn PDF document text
    • https://kopari.hu/files/file/17460039297.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2e02ad38a---49367031791.pdfIn PDF document text
    • http://sun-green.nl/ckfinder/userfiles/files/73499171925.pdfIn PDF document text
    • http://bvsaigonbinhduong.vn/uploads/files/28128688719.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a8671121574---zutoputuginefa.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083005391a19---tesiximiw.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/16090d71fd0165---3903486080.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c429591856---panirilarudoto.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d4d249adba0---38739578295.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4c151f77d---65885959299.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/dbb4cfc18b8a1c73032ec81e689f5737/20374986502.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/29537be75b1fa039a2cda0738c4282b9/51922501899.pdfIn PDF document text
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DA 10960 bytes
SHA-256: 7718d9b8c5b604e16037f347912350b2e0e125585de1471f22f285c13b09adaf
font_01_sfnt_off0001104e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1104E 16696 bytes
SHA-256: 502e7a95e3845e1294935cd7d6c1dfcec4374589a8e4948b628affe2ad60184e
font_02_sfnt_off00013bf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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