Malicious PDF — malware analysis report

Static analysis result for SHA-256 98294bb0482870bd…

MALICIOUS

PDF

84.1 KB Created: 2021-09-15 23:28:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: de2448015ab5401e25ee38cd589c3d8b SHA-1: 55ba8610dcb4a2afbde3cd3355428c0fbea414bf SHA-256: 98294bb0482870bd773173a3f9fbc6eed4215e9e7ff2faedb29ae84c0ca3ac35
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to disposable hosting or compromised WordPress sites, indicative of a link farm used for phishing or malware distribution. The presence of embedded JavaScript further suggests malicious intent, likely to execute further malicious actions or redirect the user. ClamAV detection as 'Pdf.Phishing.Trojan' strongly supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 7

  • 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.
  • 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://tydafa.com/dafa/uploadfiles/20210903044812.pdf In PDF document text
    • http://vswet.ru/f/zubabexekizapewudibawebol.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/76968173161.pdfIn PDF document text
    • https://5ky13lu3-1251.com/contents/files/97746153653.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/161315921cd5e4---150165361.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/dotapobipekeboratesajuza.pdfIn PDF document text
    • https://fong-cai.com/upload/files/74450473462.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/wefunitenukepe.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/161378d8d0e197---pivituwaw.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/84943567760.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/64934002411.pdfIn PDF document text
    • https://ensegun2.com/ckfinder/userfiles/files/finupokesaxefefevidel.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc47c223d4---91049150078.pdfIn PDF document text
    • http://hulstcustoms.ru/uploads/files/rifavajupekuwebidewiban.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/26459348637.pdfIn PDF document text
    • http://noithatlekhanh.com/Images_upload/files/96206383905.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/kivinureduzizozixalogo.pdfIn PDF document text
    • http://www.immo-uno.com/ckfinder/userfiles/files/94384381980.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/jibuvovugotifasojukurafax.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16136f2ce45ded---nawelapopadejowofazos.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/nitobofelides.pdfIn PDF document text
    • http://svenskafik.se/uploads/fckeditor/file/kinokuzigigogokabudotor.pdfIn PDF document text
    • http://chornakorn-packing.com/ckfinder/userfiles/files/67495259465.pdfIn PDF document text
    • https://digicpictures.com/downloads/29010752822.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141cfabbf11e---55024181080.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/wuweluruwavu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=how+update+android+11PDF 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_off0000e21c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE21C 10400 bytes
SHA-256: 9879dbce0bac55977191e772c0f2d6bd4e17acdf7a4089da47267e51ab634bee
font_01_sfnt_off0000f9c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C9 18976 bytes
SHA-256: aa7e3e99388474d76c3722e7e5ed5950958e4cab6224499e4134045125a115a2
font_02_sfnt_off00012ac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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