Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8350f3bcdd7b1d8…

MALICIOUS

PDF

74.4 KB Created: 2021-09-22 12:53:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 843f13f70a69444efef2ebbfa5ee6109 SHA-1: 5681b2d5cfa55958ee955b500780cac6b7c9318c SHA-256: e8350f3bcdd7b1d8cbdc7fa736c88c7166b4aa06dcf004b33d5f858677a15d7d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous external links, including one pointing to a raw IP address and others hosted on compromised WordPress sites and disposable domains, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://uleshuzatabc.hu/files/file/sawepodaxafitufuderidab.pdf In PDF document text
    • http://transportdiverse.com/uploads/files/suxuzezukopir.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/disabor.pdfIn PDF document text
    • https://muzpony.de/obrazki/file/xofisalubojewosazomu.pdfIn PDF document text
    • http://aguito.madteam.net/ckfinder/userfiles/files/79510996952.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613ffec42a5dd---jonufekiderikeripe.pdfIn PDF document text
    • http://back2wood.de/userfiles/file/resapuboxoga.pdfIn PDF document text
    • http://zmz72.ru/files/file/vaberexugikopafimi.pdfIn PDF document text
    • https://minhkygroup.com/luutru/files/51895051154.pdfIn PDF document text
    • http://185.33.116.142/~bbyacht01/upload/files/76921081745.pdfPDF link annotation
    • http://ukwoodrecycling.com/userfiles/files/ketarezadixepodefoto.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/50290912119.pdfIn PDF document text
    • https://websbag.com/uploads/files/geruzomabizizepuwef.pdfIn PDF document text
    • https://ctcitsupport.com/media/files/85668596881.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/0efe6620ffa912118cfbcbd4ca0ad8d8/25704930797.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/muwanajav.pdfIn PDF document text
    • http://rld-carbon.com/file/vafuzusuwagov.pdfIn PDF document text
    • https://almuhja.com/ckfinder/userfiles/files/fubawisi.pdfIn PDF document text
    • http://www.nbc.com.vn/ckfinder/userfiles/files/26742702380.pdfIn PDF document text
    • https://inprovit.com/ckfinder/userfiles/files/taxofapisasedobamopo.pdfIn PDF document text
    • https://noddy.nu/images/file/29478656238.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1613d69bfd4a84---jafuva.pdfIn PDF document text
    • https://yasacompany.com/upload/files/jirobaradizorula.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/9e4ce9717dcd12a9a3c5063068e06bb7/9291677400.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=interception+sms+androidPDF 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_off0000c1ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1BA 10580 bytes
SHA-256: 50ed4f6ddb37b5db5d6b43750312bc1d8b6093b5fae62deb846349ac12b9b115
font_01_sfnt_off0000d9d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D8 16204 bytes
SHA-256: 92b9cf165ec2c39b4748e77ad27705872a4aaa875887b417d28900a4a7fe32d2
font_02_sfnt_off000103a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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