Malicious PDF — malware analysis report

Static analysis result for SHA-256 769e51538b000526…

MALICIOUS

PDF

137.3 KB Created: 2021-09-16 17:19:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2e7f9049472bd12b47124cab443b4689 SHA-1: b1b1a5d7e9b8eb1f6a7272c514a8ea17195e22e8 SHA-256: 769e51538b0005261487fb47e1889fa534f287dbf6c07e86712d11c63bb8b487
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 https://smidgel.ru/uplcv?utm_term=the+science+of+interstellar+pdf PDF link annotation
    • http://naviway.su/upload/files/63983371672.pdfIn PDF document text
    • http://penzion-u-zamku.cz/files/file/wimerasokivebikigixow.pdfIn PDF document text
    • http://montesantangelo.it/files/files/28407504324.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/41629378903.pdfIn PDF document text
    • http://microsolder.hu/userfiles/files/tawanubebilisawo.pdfIn PDF document text
    • http://expertcomptablecourreges.fr/michel_courreges/userfiles/file/bulisakitazel.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/853e946401d7ca35d10b58d02eb71a99/wewomid.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16131a332a2e04---duxenagiwarakut.pdfIn PDF document text
    • https://onlinendttraining.net/files/80566606215.pdfIn PDF document text
    • https://sikdercollegeofpharmacy.com/scp/ckfinder/uploads/userfiles/files/nufujixuk.pdfIn PDF document text
    • https://peintures-descours.fr/fichier/files/sewuzeri.pdfIn PDF document text
    • https://digireg.ru/upload/67206190270.pdfIn PDF document text
    • http://hoachattn.com/image/files/52449571151.pdfIn PDF document text
    • http://artin-intranet.com/ckupload/files/36385755536.pdfIn PDF document text
    • https://redengewinnt.com/userfiles/file/riwor.pdfIn PDF document text
    • https://adtw1.elfjane.com/ckfinder/userfiles/files/nodenasisigakufanaze.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613a85ea11e2f---8922921143.pdfIn PDF document text
    • http://lindendirect.com/ckfinder/userfiles/files/13640940753.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410d72ca173---2214899345.pdfIn PDF document text
    • http://weorderfood.com/uploads/files/92710408415.pdfIn PDF document text
    • https://pharma-tools.pl/galeria/file/46914577136.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/m02pb5ja2v5tni4rm3hgike2n0/zafuxobito.pdfIn PDF document text
    • http://taispacedesign.com/upload/files/16726099430.pdfIn PDF document text
    • http://ambulatorioveterinariocigliano.com/userfiles/files/95734390256.pdfIn PDF document text
    • https://inwestorfinanse.pl/userfiles/file/vuletepodusojezimikivi.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_off0001aff7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AFF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001c809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C809 20808 bytes
SHA-256: 1a769f0d0f982411e680efdfcb72e68e1a0ba98d3d12398c021c4e4a384e68f5
font_02_sfnt_off0001fecd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FECD 10680 bytes
SHA-256: b15c795d9df591fa4993cfacf1afc4b56e6015e737434cdee74ab4744fafcb26

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