Malicious PDF — malware analysis report

Static analysis result for SHA-256 d74c47dc5250cd9e…

MALICIOUS

PDF

70.5 KB Created: 2021-10-05 09:59:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 1f6610e22ea4f8d3160c040bb62a4800 SHA-1: 2c184edc7000852ee9f401a908a8e9571dc3c92b SHA-256: d74c47dc5250cd9e03867474e3582ca0d04dfc0f7bf39235f0877d9e944340d9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to distribute malicious content or redirect users to phishing sites. The presence of embedded URLs and the nature of the heuristics indicate an attempt to trick users into visiting external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://studiotecnicoforace.eu/userfiles/files/68381993056.pdf In PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140bb3842a52---rijelemedinisigum.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ee6b7e5533---98400107195.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1614e76af8a116---kozasusap.pdfIn PDF document text
    • https://mabuksusu2.com/contents/files/98247787757.pdfIn PDF document text
    • https://ahha.az/userfiles/file/53485499451.pdfIn PDF document text
    • https://csp-pub.com/stockages/files/56657119220.pdfIn PDF document text
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jufinolofadotetixibovafol.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/89114020245.pdfIn PDF document text
    • https://el-tall.pl/pics/file/76763624468.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1614bfb114fe16---41572280664.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615671e74efe1---gufozidaras.pdfIn PDF document text
    • http://prabashproperties.com/ckfinder/userfiles/files/vevadedif.pdfIn PDF document text
    • http://songdolandmarkcity.com/userfiles/file/vegetilip.pdfIn PDF document text
    • http://srtcivilnorth.com/ckeditor_file/files/98030162051.pdfIn PDF document text
    • http://costruzionibulagna.it/userfiles/files/tovebisizivi.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/5228888818.pdfIn PDF document text
    • http://sanzmendia.com/userfiles/files/ladusiluniwe.pdfIn PDF document text
    • http://sanalights.com/admin/admin/uploadfiles/file/guzifofaxulexigizibene.pdfIn PDF document text
    • https://ibshospitals.com/userfiles/file/38894251561.pdfIn PDF document text
    • http://gs-metals.com/filespath/files/20211002231543.pdfIn PDF document text
    • http://izhar-energy.com/userfiles/file/wekajabolojilamiwowatag.pdfIn PDF document text
    • http://www.tahi.hu/ckfinder/userfiles/files/nusomuvexesegipofos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=2nd+order+linear+nonhomogeneous+differential+equationsPDF 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_off0000b408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB408 15300 bytes
SHA-256: 593a03045610c2b213b31884888da3135bbe8daceb3fb7dd8d211df5be775e80
font_01_sfnt_off0000dab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f2ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CE 11068 bytes
SHA-256: 9eba14b70cdd91a32fd0e6e4153c4c6a558cde6d9e99d43a9cb98fe8bf8df669

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