Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e2ef3e9da2500f3…

MALICIOUS

PDF

83.0 KB Created: 2021-09-19 07:01:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 78ed532682fe08242777e2eeff7bf3c8 SHA-1: 17632e23861dff9ec89260224f9ce6adf48a5998 SHA-256: 6e2ef3e9da2500f302b09fd21af4e129a5ae298dee0c15d5fa29283654c243ff
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on compromised CMS uploads, suggesting a phishing or malware distribution lure. The presence of numerous unknown URLs, many hosted on disposable domains or compromised WordPress sites, further supports this assessment. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16137fd7799c28---diwasupogoxifuzekimomi.pdf In PDF document text
    • http://saveondealz.com/ckeditor/ckfinder/core/connector/php/uploads/files/wogonuj.pdfIn PDF document text
    • http://unionasset.net/file_upload/spaw_upload/file/20210913223548.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/50225894352.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/foloxadezapilijev.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161305d72dfdab---4105023702.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/koxazibilipe.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/161462ff620cfe---80995167069.pdfIn PDF document text
    • http://drsrkbedcollege.com/ckeditor/ckfinder/userfiles/files/36130246917.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/161374832bfe80---12351950320.pdfIn PDF document text
    • https://dintek.eu/uploads/file/60175625956.pdfIn PDF document text
    • http://vhz.cz/user-files/48748795470.pdfIn PDF document text
    • http://vodnik48.ru/content/file/kadupiradadizinafur.pdfIn PDF document text
    • http://kubak-ubezpieczenia.pl/userfiles/file/44499450636.pdfIn PDF document text
    • https://dafelia.com/files/66583650188.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/wijexixes.pdfIn PDF document text
    • https://studiopros.com/userfiles/file/In PDF document text
    • https://mcdelandes.ca/uploads/file/pituxofadejixo.pdfIn PDF document text
    • https://www.wemservice.com/ckfinder/userfiles/files/gekogamiwej.pdfIn PDF document text
    • https://www.icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/82418664755.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/xikumekefumiwepo.pdfIn PDF document text
    • https://jechrina.gr/FCKeditor/userimages/file/5544498525.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/33040824632.pdfIn PDF document text
    • https://autopits-directo.migrupoq.com/ckfinder/userfiles/files/15726274003.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=apps2fire+apk+for+firestickPDF 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_off0000df4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF4B 18056 bytes
SHA-256: c00ff69930ac96d460962e24d8d5e10d9ef505f14337d82bcde76ea75e693232
font_01_sfnt_off00010e1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12635 10516 bytes
SHA-256: 281a8d32b4e828197339e1af1cb60a02c353fa608a72fb33c34b5fcbd54d3629

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