Malicious PDF — malware analysis report

Static analysis result for SHA-256 0abb24dfb9ce2451…

MALICIOUS

PDF

71.8 KB Created: 2021-09-26 17:54:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1dffbdfac23e2a0828e3041089f45805 SHA-1: 2671ee6f6a2a6c62188fdbb0cc1d81561d792ce2 SHA-256: 0abb24dfb9ce245134fda375ba57f8873de8e8d45a4a12d90c28d5e1005db674
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://studiovalecchi.it/userfiles/files/55544257746.pdf In PDF document text
    • https://adian.eus/files/galeria/files/45345136774.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/5d730884b09400bd8ea8f7306b2282bc/digovetifafamopenaj.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/varazote.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/majojugivopesijog.pdfIn PDF document text
    • http://studiotecniconuti.it/userfiles/files/40057308839.pdfIn PDF document text
    • https://irepairplus.nl/app/webroot/files/userfiles/files/dikokuketilevevebifivu.pdfIn PDF document text
    • https://grupahatak.pl/admin/_fck_files/file/76478573728.pdfIn PDF document text
    • https://peptidturkiye.com/ckfinder/userfiles/files/zulidanaxakazegegafebo.pdfIn PDF document text
    • http://lamgi.pl/ckfinder/userfiles/files/zekowutatu.pdfIn PDF document text
    • https://3rproject.eu/ckfinder/userfiles/files/84824799606.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/segevuvepipir.pdfIn PDF document text
    • https://motodubai.com/uploaded_images/files/78812369258.pdfIn PDF document text
    • http://pol2-simf.ru/userfiles/file/40850413857.pdfIn PDF document text
    • http://sonnenheizungen.ch/fckeditor/editor/images/file/83335089830.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d47509c170---40651913911.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1615048296818d---9893669997.pdfIn PDF document text
    • http://drxzhang.com/userfiles/file/kiturefaribodavowepelob.pdfIn PDF document text
    • http://www.fonfe.com/uploads/files/tigagunobozifaxurenateto.pdfIn PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/67980172703.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130152b718f8---19552144220.pdfIn PDF document text
    • http://alhambra.kopanramen.com/uploads/files/xijujafedepez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=ensayo+sobre+las+tics+pdfPDF 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_off0000b663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB663 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE7A 10852 bytes
SHA-256: 8f824aefe48bdc4daa850976589ded45e982ddb60b6a2ee1d1345b2bb5b2f0fb
font_02_sfnt_off0000e771.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE771 16776 bytes
SHA-256: 6105fd9599e5ed7d2a5e0be92c31a47614b37cdca58ae0a023972e1042da7b46