Malicious PDF — malware analysis report

Static analysis result for SHA-256 edce454f75773233…

MALICIOUS

PDF

81.9 KB Created: 2021-09-01 17:01:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 56f5984939e00cf17e2be39854a4fbf0 SHA-1: 99362e04a956bc2f71f04a8298793de1b9d179eb SHA-256: edce454f75773233d9220022b66e3c1d41111909af59f4b94729c597cff66e7b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this. No scripts were extracted, but the overall structure and heuristic firings indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://ccsup.co.th/uploads/ckfinder/files/97270155639.pdf In PDF document text
    • http://absigorta.com/E/file/zitoxalogowi.pdfIn PDF document text
    • http://ambulatorioveterinariobubiniregini.eu/userfiles/files/lifegepegujowageluxatuna.pdfIn PDF document text
    • http://appinaris.net/ckfinder/userfiles/publics/files/85727228962.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/9a797ee2793020a00c7c140e0158bb35/zufin.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16118cbf6dfcba---77812598034.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/36af933346892a628abef775b0ced07e/34129504923.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/8nqfb4ja6n98q97ihqqsjekjf3/movevofiv.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de3a7fba1b5---84678162437.pdfIn PDF document text
    • https://internationalmedia.com/userfiles/file/48816785004.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/nodebifatapezal.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16080e3fb0dd6b---10363951634.pdfIn PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/bizaw.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/59148b410ae4f1693cebded0d9c07611/92482860272.pdfIn PDF document text
    • http://desagresbrts.com/clients/34568/File/43654943131.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/36157637965.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210527_9CADA74E289161E7.pdfIn PDF document text
    • http://a9188.com/upload_files/art_files/files/20210722_173743.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/16099bbab29abf---40258589900.pdfIn PDF document text
    • https://esportenerd.com/app/webroot/ckfinder/userfiles/files/76275578972.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/424092e6ebe6b0c09f44f869529c5518/2601177007.pdfIn PDF document text
    • http://jessicarossitto.com/clients/7/7c/7c16b8c799dae9ffcd1258f31d6ff645/File/budedotanijufi.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/mivopo.pdfIn PDF document text
    • http://epwuae.com/userfiles/file/7811048854.pdfIn PDF document text
    • http://gtshotel.it/images/file/64314825477.pdfIn PDF document text
    • https://amharicmusic.net/assets/amharicmusical/anmutkinde-yetosatera.mp3In PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=amharic+classical+music+mp3+free+downloadPDF 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_off0000dcf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF9 16332 bytes
SHA-256: 0f49d09450ae35f8896c76656ca6d7c9313b51e49e69237fab42eccd3f3f5cab
font_01_sfnt_off000106aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106AA 11128 bytes
SHA-256: 3ce59ea787b90a71d5eb0ee1a0bb82a59bc49cc9e259c86ca618c6a316b96388
font_02_sfnt_off0001207c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1207C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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