Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e454f0dc4590dc5…

MALICIOUS

PDF

88.7 KB Created: 2021-09-14 06:44:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cbe64009a50b4deb68adffb37ce7256a SHA-1: 426e50d8563fdc87718e2474bf7092427564df05 SHA-256: 3e454f0dc4590dc5ac2718f18d27fe212456625735b125feb553db348d9ee3f7
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating malicious intent, including a link farm pointing to compromised CMS upload storage and a lure for a password-protected archive. The ML classifier and ClamAV detection strongly suggest this is a phishing or trojan delivery mechanism. While no scripts were directly extracted, the presence of embedded URLs and the overall structure point towards a phishing attempt designed to trick users into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://dzido.pl/userfiles/file/zelelafapujupinu.pdf In PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/55386112191.pdfIn PDF document text
    • http://rasciindia.com/firetech/ckupload/files/gexujunevomaniduvatinozi.pdfIn PDF document text
    • http://poney-club-romilly-aigre28.fr/userfiles/file/86076318758.pdfIn PDF document text
    • http://formpart.com/upload/ckfinder/files/pufufamupusogow.pdfIn PDF document text
    • https://treasurehunterdetectors.solar-ovens.net/ckfinder/userfiles/files/levebefekozekobexim.pdfIn PDF document text
    • http://kamnitikamini.si/upload/files/vuratubideda.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/lipepomuxuzavanizabojida.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/e39rfpeo3bl99r0u1ai5rlvm07/ziropupogazoxokudawij.pdfIn PDF document text
    • http://getrade.net/uploadfiles/file/52689579399.pdfIn PDF document text
    • http://kossuthdigisuli.hu/userfiles/file/41528978220.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161384ba6aece7---furuselivi.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/famigawejitopoxo.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/1942267168.pdfIn PDF document text
    • http://musthighschool.mn/ckfinder/userfiles/files/kevarogibazaxixakuvifim.pdfIn PDF document text
    • https://stepweystudy.com/ckfinder/userfiles/files/71885494776.pdfIn PDF document text
    • https://luckyfood.itweald.com/uploads/files/613d575f64d07.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/58074320896.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/f92ad166c89956e17524d0fb6dd5e0c2/tesikodi.pdfIn PDF document text
    • https://rh-h1tapi-turbo.com/contents/files/1182566252.pdfIn PDF document text
    • http://pdww.ru/ckfinder/userfiles/files/vabofazin.pdfIn PDF document text
    • http://trubaopt.ru/content/file/lezudobatonexuwifolanavo.pdfIn PDF document text
    • http://gtshotel.it/images/file/42298926341.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/90613957061.pdfIn PDF document text
    • https://sbmhavacilik.com/userfiles/file/17721700019.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=vidmate+2015+old+version+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_off0000f673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF673 10960 bytes
SHA-256: d2d8f5adfd9adbd997f149dc2525fcd1434cfca564cfb786e2da79678b356b5c
font_01_sfnt_off00011003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11003 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12815 17456 bytes
SHA-256: 9bb665a6b4edf06c8f55e95e340ca85f174f950f76f02a552f4f75cf9d226b16

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