Malicious PDF — malware analysis report

Static analysis result for SHA-256 62a0cfd4b4e36b11…

MALICIOUS

PDF

92.4 KB Created: 2021-09-15 05:33:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 292ca79587da3c210b669251935ae99a SHA-1: a6fc8c71cd0d7e1bf80a936100b87fe3ec953b6c SHA-256: 62a0cfd4b4e36b11998de4e0dffc63d782692d5d6d781f914991bf3ab8afd9ab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It functions as a link farm, with numerous embedded URLs pointing to various domains, some of which are associated with compromised CMS uploads. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://majubesar.com/contents/files/defutoketemanib.pdf In PDF document text
    • http://www.zdravotechnika.com/ckfinder/userfiles/files/fufosomuvalejobupur.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/78824463576.pdfIn PDF document text
    • http://szm.hu/userfiles/file/sufelinujufasofixisip.pdfIn PDF document text
    • https://defi128.phpascal.com/userfiles/files/kurokalupojifiw.pdfIn PDF document text
    • http://productinfo.in/konadnew/userfiles/file/xakoxexagogusub.pdfIn PDF document text
    • https://itexpertdog.com/upload/files/22438036328.pdfIn PDF document text
    • https://photofetimages.com/10558549426.pdfIn PDF document text
    • https://iwistw.com/upload/files/benumo.pdfIn PDF document text
    • https://tonerihned.cz/userfiles/file/27780046380.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/37139862925.pdfIn PDF document text
    • https://nikunjfoundation.org/ckfinder/userfiles/files/fadozuzekogakavix.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/161392ebf3fd11---sarulimopewofa.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/161414dd950175---nuwejajifatax.pdfIn PDF document text
    • https://homeuu.biz/upload/ckeditor/pages/files/80230603594.pdfIn PDF document text
    • http://abworder.com/uploads/files/32870064526.pdfIn PDF document text
    • http://tinhdaurosa.com/Images_upload/files/9366174215.pdfIn PDF document text
    • https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/32459450190.pdfIn PDF document text
    • http://amsuatrust.org/survey/userfiles/files/vufesos.pdfIn PDF document text
    • http://louisamerino.com/userfiles/file/18900846951.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/161415a4430c61---18973603980.pdfIn PDF document text
    • https://www.uflo.edu.ar/ckfinder/archivos/documentos/9107892264.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=delta+rate+of+changePDF link annotation
    • http://alessandrotria.altervista.org/areap/ckfinder/userfiles/files/1936227003.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_off0000f98e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF98E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000111a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A0 22224 bytes
SHA-256: 716793fb62384dd4bd3b4efe0a85a9ec95044704fca341c248ae8232f500afa6
font_02_sfnt_off00014c88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C88 10356 bytes
SHA-256: 4c428c0f8b956e3f1112c2c6f3469e9443945dc5c101a910f0f2230cc3953ba7