Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfd8da3b1c84333d…

MALICIOUS

PDF

82.3 KB Created: 2021-09-21 15:28:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7d2c8fa2c5ef2dbd83a4327274230852 SHA-1: 4b73d7120773ac347a61acb46bdad766ef5a71c7 SHA-256: dfd8da3b1c84333d5ac99de0b0a1f71b6cf73176c4ddc16d1709e306d2f80c11
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are structured as a link farm. Heuristics indicate these links are likely intended to direct users to malicious content or phishing sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1614526c708cd8---fekubikofekezafum.pdf In PDF document text
    • http://filtrydokoparek.pl/img/all/vozinixog.pdfIn PDF document text
    • http://superlitefan.com/uploads/files/jejojakimefobirejezarovi.pdfIn PDF document text
    • http://mvdeastudio.it/userfiles/files/93291648103.pdfIn PDF document text
    • http://merklink.nl/site/data/ws/files/bawetozomutulifova.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161401b4faffda---69877652466.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/59413741008.pdfIn PDF document text
    • http://www.tokyomagic.jp/images/library/File/26827602568.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/biwasexusitenabanoxobaza.pdfIn PDF document text
    • http://realcomfort.ru/content/upload/file/30174379020.pdfIn PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/45183135915.pdfIn PDF document text
    • https://duvarkagidierzincan.com/userfiles/file/sukugejujawipede.pdfIn PDF document text
    • http://hockjoohin.com/admin/uploads/file/botogebikojudisivu.pdfIn PDF document text
    • http://ville-dammarie.com/ckfinder/userfiles/files/38193561561.pdfIn PDF document text
    • http://sun-green.nl/ckfinder/userfiles/files/tovijam.pdfIn PDF document text
    • http://retrievers.su/ckfinder/userfiles/files/54910104596.pdfIn PDF document text
    • http://phannhan.vn/files/usersfiles/files/66745609996.pdfIn PDF document text
    • http://nhatrangpalace.vn/app/webroot/upload/files/lukavuseniv.pdfIn PDF document text
    • https://phu-komplex.pl/pliki/file/9035298357.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/161420b4d109c8---24390578222.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=solidworks+mobile+app+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_off0000ddf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF9 10848 bytes
SHA-256: 0376cb7d862fa6389f157c68636afca615c87ab3f5e522b4645651061841aa54
font_01_sfnt_off0000f6bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BD 17464 bytes
SHA-256: ea2bb3e4b0b396574aa6ba0c6ee596897131ac5db03b2c9e6a12b487057501eb
font_02_sfnt_off00012424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12424 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1