Malicious PDF — malware analysis report

Static analysis result for SHA-256 0544102124d4c42e…

MALICIOUS

PDF

84.6 KB Created: 2021-09-20 01:02:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 03bfbc69ea64d4b90ef933abd4d86829 SHA-1: 61ba8e92ed36ba84c0e8f09402eb5864c434999c SHA-256: 0544102124d4c42eb67afbf4f2f1ac1b8ba4c16464bc54815e0350ba9bc1812e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that point to compromised websites and disposable hosting, suggesting it functions as a link farm to distribute further malicious content or phish users. The presence of external URI heuristics and link farm indicators strongly supports this attack pattern.

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://coretry.ru/uplcv?utm_term=minecraft+mobile+online+multiplayer PDF link annotation
    • http://podlahyadvere.sk/editor_uploads/system/files/74069359744.pdfIn PDF document text
    • https://www.utn.ac.cr/sites/default/files/files/jemajijakejo.pdfIn PDF document text
    • http://cdn.eagle.mn/uploads/userfiles/files/58320033941.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613506c68d4fc---raxepulobibozidavop.pdfIn PDF document text
    • http://janjoling.com/public/ckfinder/userfiles/files/4864054422.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a2ee7f384---laxumemepadodo.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/lonikuror.pdfIn PDF document text
    • http://b-solutions.net/userfiles/file/vekubepefolokegizofinarov.pdfIn PDF document text
    • https://o2opr.co/userfiles/files/88579623311.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16135ab733ea39---sitezirel.pdfIn PDF document text
    • http://biometria.pl/photos_fck/file/dobelefesum.pdfIn PDF document text
    • http://fredericjean.net/oplusco/file/1679668476.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/f0cb7486881a54671cc991e93537e217/69476695616.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16140fb27a0be6---pezawufibajomanizibenosux.pdfIn PDF document text
    • http://dichvumucin.com/upload/ckupload/files/96462511872.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/98901908669.pdfIn PDF document text
    • https://valstybestarnyba.com/upckfinder/files/54830527015.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/nidujisavofamid.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/file/1631567079_1.pdfIn PDF document text
    • http://generoussecurity.com/uploads/4466389934.pdfIn PDF document text
    • https://ville-saintleonard.fr/pdf/xuzat.pdfIn PDF document text
    • https://promtour-rural.ro/userfiles/file/wiwojisewup.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/79376816408.pdfIn PDF document text
    • https://amt-alarmy.pl/userfiles/file/59253011318.pdfIn PDF document text
    • http://abwmechanicsville.com/uploads/files/bibutuwerolefizited.pdfIn PDF document text
    • 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_off0000e579.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE579 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD90 10820 bytes
SHA-256: ef4cec8f6d2003d6264e6fdc5cb375f7dc7354e97abf1752172697b422a511cd
font_02_sfnt_off0001164c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1164C 17892 bytes
SHA-256: 8f23061dadd45db7d325b3a6fac0bd3c1fba43c794ac3638d29624c771386378