Malicious PDF — malware analysis report

Static analysis result for SHA-256 f49374b623545119…

MALICIOUS

PDF

77.5 KB Created: 2021-09-23 19:56:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a018024690cae9206fcdd4340b04e310 SHA-1: b5f4e042dbf748a60e20a08f07cff217298345ed SHA-256: f49374b6235451199871b09732cad05e0a892865aebc8ccaaa15a093dac02daa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The presence of embedded URLs and the nature of the heuristic firings indicate a likely attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://synerhu.ru/uplcv?utm_term=traduire+page+web+android PDF link annotation
    • http://doudou.tw/userfiles/files/81361487442.pdfIn PDF document text
    • https://milsagliksen.org/upload/ckfinder/files/79251524411.pdfIn PDF document text
    • http://easternhoteljeju.com/FileData/ckfinder/files/20210909_DBDA3F4D63D2529D.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148139213753---69306252934.pdfIn PDF document text
    • http://huseyindurmuslar.com/images_upload/files/12727260195.pdfIn PDF document text
    • http://www.santamyoga.be/images/file/83412298481.pdfIn PDF document text
    • http://prasongp.com/file_media/file_image/file/bawaxukekenilimagirumum.pdfIn PDF document text
    • http://timnhanhonline.vn/upload/files/39831792256.pdfIn PDF document text
    • http://studiotecnicolamanna.com/userfiles/files/55740412952.pdfIn PDF document text
    • http://0048.pl/48files/file/51754941575.pdfIn PDF document text
    • https://www.eos.org.eg/ckfinder/userfiles/files/gerigel.pdfIn PDF document text
    • http://khocabien.com/uploads/files/10566415098.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec78d91794---92254263296.pdfIn PDF document text
    • http://teplo76.ru/uploads/file/58446246082.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16149112da826b---sesofuku.pdfIn PDF document text
    • http://globalbando.com/DATA/upload/files/202109041126324945.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408794df4aa---67071869496.pdfIn PDF document text
    • http://sloplast.com/userfiles/files/67249525262.pdfIn PDF document text
    • http://columb-sklep.pl/userfiles/file/21374448076.pdfIn PDF document text
    • https://edusfera.pl/upload/file/doripofivim.pdfIn PDF document text
    • http://hamyarsanatco.com/ckfinder/userfiles/files/5951696530.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/2758481803.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/1138991040.pdfIn PDF document text
    • http://basse-normandie.annuaire-regional.com/ckfinder/userfiles/files/mekunakapoma.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_off0000c865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC865 18736 bytes
SHA-256: 44153920a0cd1c993a426d29e570105b6309fcde4ffc1071e0d7c9cd530aa21c
font_01_sfnt_off0000f8ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AC 10544 bytes
SHA-256: 5fef668d1f19626bab098ea42da6dea0e8b19e51f5946dee42ac33a7d4ddf1fd
font_02_sfnt_off00011060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11060 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1