Malicious PDF — malware analysis report

Static analysis result for SHA-256 033277db85bb95d7…

MALICIOUS

PDF

89.9 KB Created: 2021-07-05 15:21:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: fa794ef653cb16e362cd8e4f44f615d0 SHA-1: cc251cfb4c28b521bd2840cb78d450030e19d0b7 SHA-256: 033277db85bb95d7161d418834e0c1685a2c10889009d0b9c631c8b9d91f445f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://theatresaucinema.fr/uploads/file/81666679293.pdf In PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608828484d873---kekusurazejefusunal.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/kenajatidurufodutegi.pdfIn PDF document text
    • http://scottleddy.net/clients/862555/File/boxutotibakegerapogigi.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/c8da0907eda441db3c513a531f317dcc/foxajakime.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/xovibelolawuxigane.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1e3350363---govari.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/begelijatetiwitukefa.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/65200401192.pdfIn PDF document text
    • http://119hero.kr/userData/board/file/vupapazodovuni.pdfIn PDF document text
    • https://mfdesign.hu/files/file/5696417829.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2cda87c22---taxubevutivitor.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/6162875286.pdfIn PDF document text
    • https://orangcar.com/app/webroot/upload/files/27556469612.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/f2rliia60svedn4m0f6aue7jh8/nuwewimube.pdfIn PDF document text
    • http://biaikatolikus.hu/files/file/63960853516.pdfIn PDF document text
    • http://praguetransfer.com/files/file/votujulewujaruvogis.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/8123400726.pdfIn PDF document text
    • http://paliukenas.lt/i/File/patuzudafifoxiloronaba.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077b241a4466---96206225781.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5ddd08b6b0949db9f1d64b7250b1f751/33153952465.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609939cf89aff---68366181148.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/160f2ab08df0fd7961674ce516ab71eb/kanudilezenito.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160adaf991ac33---tonitumonirasisegod.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160a953f2ecbee---gukuvodepobizerizukibe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=fluid+mechanics+and+thermodynamics+of+turbomachinery+6th+edition+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_off0000f2fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FD 19488 bytes
SHA-256: 09badf8469b5ade5987347849c21c40aeed069b66680e87088129d3a8c719f64
font_01_sfnt_off000126c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013edf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EDF 11384 bytes
SHA-256: dbb3baacddb9b0772db51fe8d67d15f6b2b4f5dedea37c12744d60454da1a414