Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcdc401f9857683b…

MALICIOUS

PDF

69.7 KB Created: 2021-09-16 06:48:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a2685cfd7e0abf6f93562b9f4f05b97b SHA-1: a01e641f9597e823812e7ddeb1514250f98d6279 SHA-256: dcdc401f9857683b6838dca3ff8b8791782b34f038cc05fca9f67fd666be826f
156 Risk Score

Malware Insights

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

The PDF file contains a link farm, with multiple URLs pointing to potentially compromised websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of numerous links on disposable hosting and compromised CMS uploads suggests an attempt to obscure the final destination or leverage existing vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://goooinggroup.com/userfiles/files/20210905_041220.pdf In PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/161401163d029c---33020880912.pdfIn PDF document text
    • http://rudolphi.nu/userfiles/file/tebim.pdfIn PDF document text
    • http://severstroysnab.ru/userfiles/file/gizanab.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/bilewevigonusalovud.pdfIn PDF document text
    • https://autonoleggioassereto.com/file/44589882204.pdfIn PDF document text
    • http://plechotice.sk/tmp/file/siwuzuvenazaxek.pdfIn PDF document text
    • https://nocenzura.space/web/img/podborky/files/jijivipemeroximabeto.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/161400ff153446---xozubiwabuxaloxeze.pdfIn PDF document text
    • https://jvlegacyhomerepairsmd.com/nbloom/fckuploads/file/boxufobomofosimozafosa.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/wefunitenukepe.pdfIn PDF document text
    • https://valenciamaids.com/userfiles/files/josidenegasewenexuxal.pdfIn PDF document text
    • http://klemanpince.hu/files/file/67786817228.pdfIn PDF document text
    • http://concilianavarra.com/userfiles/files/94282640588.pdfIn PDF document text
    • https://luatsuavina.com/userfiles/file/71479365440.pdfIn PDF document text
    • https://mkontroll.hu/File/polupufadez.pdfIn PDF document text
    • https://nilsahost.com/calisma2/files/uploads/jegazupowegekil.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/53332396879.pdfIn PDF document text
    • https://interativacorretora.com/fotosempresa/files/bizolen.pdfIn PDF document text
    • https://webkapper.nl/ckfinder/userfiles/files/tezivibime.pdfIn PDF document text
    • https://bfull.ru/uploads/files/viriv.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc96e18854---25804621309.pdfIn PDF document text
    • http://progetec.org/userfiles/files/87978223978.pdfIn PDF document text
    • https://nepalmicrofinancesummit.org/userfiles/files/29879370454.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=8+ball+free+coinsPDF 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_off0000b45a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB45A 14920 bytes
SHA-256: ff150e0f7f1c707f254edc7539955b8bde28dafdee4ca3baf74b7257e5e476ce
font_01_sfnt_off0000d9c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f1df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DF 10484 bytes
SHA-256: a1506b3f2d3ea68f2e22eb5f73ab702a4080e48481264fce1dd0f1a0caf16022