Malicious PDF — malware analysis report

Static analysis result for SHA-256 b68f75cb11dd9802…

MALICIOUS

PDF

68.2 KB Created: 2021-09-12 00:24:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b0068f3f117c00eed92aeb2eade71df5 SHA-1: c0a16c60d1f4e2fdcd8168b3bedadc1cdeb8b2db SHA-256: b68f75cb11dd9802f055a45a2de5d04943c813fcdb54710908f9bfebf3fabc96
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan. Heuristics indicate it contains a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the presence of numerous external URLs points to the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://drafthe.ru/uplcv?utm_term=cast+pixel+to+apple+tv PDF link annotation
    • http://www.mariabeckmann.com/fotos/uploads/files/molij.pdfIn PDF document text
    • https://edenestates.com/ckfinder/userfiles/files/vejamonaxigexupesekap.pdfIn PDF document text
    • http://universalestetic.com/userfiles/file/52758864493.pdfIn PDF document text
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/14385899363.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16131277404dc9---36451612985.pdfIn PDF document text
    • http://doubler-son-capital.com/photos/files/35689949654.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/75636750474.pdfIn PDF document text
    • https://adtw1.com/ckfinder/userfiles/files/bijubanavi.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613728ad2e661---87628845396.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/62466170719.pdfIn PDF document text
    • http://excitechem.com/userfiles/file/52144514885.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/7986776cfedf76ee2ff0853705f5dffd/53850849816.pdfIn PDF document text
    • https://srilangkapools.com/contents/files/jebox.pdfIn PDF document text
    • http://isdoor.ru/uploads/files/nuradatal.pdfIn PDF document text
    • https://uangraja.com/contents/files/82856171470.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/35855918967.pdfIn PDF document text
    • https://fiscalonline.ro/app/webroot/files/userfiles/files/dasedefibebovugut.pdfIn PDF document text
    • http://alrabbanoilandgas.com/file/files/12136149743.pdfIn PDF document text
    • http://krr-nfe.com/suratnfe/UserFiles/File/dikutapiselopalo.pdfIn PDF document text
    • http://canyonmeadows.org/userimages/palumagidubupanozij.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000aee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEE5 10240 bytes
SHA-256: 6699577b2950038fb788244e81f0a009807b7d7aefdbf2811bc158d26b5c91fa
font_01_sfnt_off0000c618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC618 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000de2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE2A 14880 bytes
SHA-256: 16ad5839f4b5b838e8e0e37c34acff2afefc9579829efdc57f877adf4246d155