Malicious PDF — malware analysis report

Static analysis result for SHA-256 324f53e8c6843ee1…

MALICIOUS

PDF

87.0 KB Created: 2021-09-09 07:04:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 513a2a545814e7731cbe6e4af6e33b37 SHA-1: 8b74337dd455e2daf9cd10fcbb440c93a685cc54 SHA-256: 324f53e8c6843ee123e39a30e26b4bfcbfe22a2f07ec39c27848fd1b43c14f62
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload storage, indicating a link farm designed to lure users to external sites. ClamAV and ML classifiers identify this as a phishing trojan, suggesting a malicious intent behind the link distribution. The presence of multiple PDF link farm heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.bevillelecomte.com/ckfinder/userfiles/files/katisasevogav.pdf In PDF document text
    • http://tasarimak.com/ckfinder/userfiles/files/11379948030.pdfIn PDF document text
    • https://www.gullyracing.it/admin/ckfinder/userfiles/files/xutezum.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/161396b0085bb9---6318676436.pdfIn PDF document text
    • http://www.me.ntou.edu.tw/ckfinder/userfiles/files/20210902_075330.pdfIn PDF document text
    • http://kaushalacademy.org/ckfinder/userfiles/files/6451609253.pdfIn PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/3090048559.pdfIn PDF document text
    • https://ruiguoex.com/upfile/files/2021/09/04/zalojit.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/83553196282.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/60593592238.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/86693994878.pdfIn PDF document text
    • http://zjqzzx.com/uploadfile/file/2021090400102473499.pdfIn PDF document text
    • https://redengewinnt.com/userfiles/file/vifafaj.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/45919851321.pdfIn PDF document text
    • http://stimatacasa.eu/userfiles/files/zadifefajomibazefibukiz.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16132b73f8923e---kumunigo.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/161338d2da6c21---rabedeje.pdfIn PDF document text
    • https://msiutilities.net/documents/netebatuloruli.pdfIn PDF document text
    • http://formpart.com/upload/ckfinder/files/mewijegetawegopija.pdfIn PDF document text
    • https://mashura.co/userfiles/files/sixekirivavutolavilize.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/95954406738.pdfIn PDF document text
    • http://daglichtfilters.nl/ckfinder/userfiles/files/rexoperolinojorudofudenu.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613961dc60265---21516179819.pdfIn PDF document text
    • http://autowagon.it/userfiles/files/59756844931.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/36288852632.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=best+walking+app+for+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_off0000f05e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10870 17216 bytes
SHA-256: 7b534afaffdd08991edec3deb673e970edcb040d0537e5c559a4c1ebd6fafafb
font_02_sfnt_off00013504.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13504 10904 bytes
SHA-256: 74249aaf615cf5b345f743b1d93d22fca171ca85ea73b118ef172e47e0407503