Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3d4c97af726cc33…

MALICIOUS

PDF

78.1 KB Created: 2021-09-02 12:21:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a7588e77c4c6d61c1771e95ccd8f8b87 SHA-1: c9228c8865918b477e7551ee932dcb14279f9c5a SHA-256: a3d4c97af726cc33d3bf1c43113c310ebda65fbcf1ccfefc114faefdc1eac910
154 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a phishing or malicious redirection scheme. The ClamAV detection and ML classifier further support its malicious nature, likely as a lure to a phishing site or to download further malware. The document body is heavily obfuscated and unreadable, preventing a more detailed analysis of its specific intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5019

Heuristics 5

  • 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
  • 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://tai-group.com/upload/files/11533110450.pdf In PDF document text
    • http://timnhanhonline.com/upload/files/vizanotuvuguduvimujitera.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd8e49fc5e---12503539394.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7f1a3bdb6---gesimido.pdfIn PDF document text
    • https://albawadiroad.com/userfiles/files/firukavuxokulex.pdfIn PDF document text
    • https://aildf.in/userfiles/file/79100249264.pdfIn PDF document text
    • http://suachuadienlanhhoaphat.com/hinhanh_fckeditor/file/givudokiwapixowemamu.pdfIn PDF document text
    • https://mclandpin.com/calisma2/files/uploads/zufumoti.pdfIn PDF document text
    • http://www.bsa.by/ckfinder/userfiles/files/10615017431.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/k8c5oh3tacqucihd2omrif75lq/wirabagenepuro.pdfIn PDF document text
    • http://arch-teh.com/pic/userfile/rizur.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/399e8b9fae63d91a2adeefd670ae6b4d/11763475966.pdfIn PDF document text
    • https://thinkhigh-tech.com/d/files/54272604079.pdfIn PDF document text
    • http://prinsart.ro/uploads/files/levuxelopukoguzirupabulo.pdfIn PDF document text
    • http://thelifelesson.net/home/tappingchanges/public_html/dowalumniusa/ckfinder/userfiles/files/55049134023.pdfIn PDF document text
    • https://aynispirit.nl/userfiles/file/53090906853.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b2d1ae99305---90529547782.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/ffd025d146dcee1f81a7599d26cac46b/redadasalixiwo.pdfIn PDF document text
    • https://motoralbini.it/files/file/95278195300.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1bff1a8423---33209477423.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/25389099936.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=journalism+and+media+studies+books+pdfPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/164c0272884084a8c1631f00e797ef1a/dubidanas.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A0 10980 bytes
SHA-256: 48c6a6472aa0b27f377e080b06bc213a94346616d22ca6fb83fea85f18c3bcff
font_01_sfnt_off0000fede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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