Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3e9e6e7a823ba38…

MALICIOUS

PDF

92.3 KB Created: 2021-09-12 14:57:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d449ad97a441f2978d85aacfa347b301 SHA-1: 3279f2e90df596bd966e64696a63b4c7bc85ff36 SHA-256: d3e9e6e7a823ba38715a5224ce5a86d510806bb7b9b9f2561e05380db9905455
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to disposable hosting or compromised CMS upload storage, suggesting a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://artin-intranet.com/ckupload/files/62237488555.pdf In PDF document text
    • http://www.parinet.fi/tiedostot/files/33420451939.pdfIn PDF document text
    • http://appextskihjthj.handysociality.com/upload/files/96464548300.pdfIn PDF document text
    • https://indianhairtransplant.com/ckfinder/userfiles/files/91558825054.pdfIn PDF document text
    • https://rrrc.us/userfiles/file/tageviboteli.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/39118381299.pdfIn PDF document text
    • http://rnralpha.cz/res/file/nevomujulitu.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/xajoselesasarevukov.pdfIn PDF document text
    • http://aasghsflqsae.handylover.com/upload/files/53608682049.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303d98a4665---64644145272.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613727b616825---mesij.pdfIn PDF document text
    • https://blugarden.eu/file/zamozeponawe.pdfIn PDF document text
    • http://npi-management.com/ressource/site-image/files/13889489419.pdfIn PDF document text
    • https://majubesar.net/contents/files/lomuvufododigorizaz.pdfIn PDF document text
    • http://originalbau.hu/imagesfiles/28461822441.pdfIn PDF document text
    • http://nuocmambason.com/upload/fckimagesfile/87ff4799c0c5cd53cd482127725d6466.pdfIn PDF document text
    • http://xinchenfast.com/upload/file/56495429905.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/96870156861.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612fac55e355f---voxogugadexew.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613320aee15f4---11075618388.pdfIn PDF document text
    • http://turskazka.ru/ckfinder/userfiles/files/xavixofigu.pdfIn PDF document text
    • https://brianspradlin.com/userfiles/file/nipodopaviwed.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=barbie+and+her+sisters+full+moviePDF 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_off00010064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10064 10976 bytes
SHA-256: 36b355cd8a3185067e385559ea6e770feafbc51534cee3ae25432ecde826b80d
font_01_sfnt_off000119b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119B2 19180 bytes
SHA-256: 8f638c236ad115dcb9572d0dfaac244fba23d4d22576401dd7811e49fd6220d6
font_02_sfnt_off00014b59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1