Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecab51929277cbca…

MALICIOUS

PDF

80.7 KB Created: 2021-09-17 20:07:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 996a0d390d4e4f21899363acdea3d092 SHA-1: 9bfc0556d21911bdca8d6e99956f2833b377abf2 SHA-256: ecab51929277cbcaf040e6342ff9360f3831dfbcc6bd5efeb38f17756e232264
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to other PDF files hosted on various domains, some of which are associated with compromised CMS uploads. The 'utm_term' parameter in one URL suggests a potential SEO manipulation or phishing lure. No scripts were extracted, but the structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://hinodanang.com/uploads/image/files/81474651481.pdf In PDF document text
    • https://numen-wow.com/userfiles/cloud/files/xonunalirafutowajes.pdfIn PDF document text
    • http://aquarium-kochi.com/app/webroot/ckfinder/userfiles/files/xovixoluloduvul.pdfIn PDF document text
    • http://karat-dobremiasto.pl/userfiles/file/nogero.pdfIn PDF document text
    • http://airmon.hu/images/files/likifunola.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/marawidodupusupowa.pdfIn PDF document text
    • http://www.oiseaubleu-promo.fr/userfiles/file/53950916685.pdfIn PDF document text
    • http://qqsbg.net/uploads/file/39039885875.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/vefazemogasonozu.pdfIn PDF document text
    • http://hissekurban.com/resimler/files/lugogijanosukudomilitulas.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161426a6f1d037---tuvigojija.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613992182bb09---tovujudasepuvifinurol.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/ed577d1aac16dc069090ce3f8c866c6e/82341962227.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/623935e933e06de9550b672c6b4901a7/pegaboz.pdfIn PDF document text
    • http://alburigiott.it/userfiles/files/84404630268.pdfIn PDF document text
    • https://ichapps.com/ichapps/ckeditor-ckfinder-integration/uploads/files/zapegitutovusot.pdfIn PDF document text
    • http://chinhsuasolieu.com/media/files/88137429504.pdfIn PDF document text
    • http://yeosingol.com/FileData/ckfinder/files/20210908_5FCF70A807B344FF.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/0ffbb1e5b3378450a5cbaf998c444a1a/xepafim.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/galojewejarev.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/67681492537.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/84188099081.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=can+android+minecraft+play+with+iosPDF 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_off0000d53b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD53B 11116 bytes
SHA-256: be276e99d188fa5f565ad6d5fc89ae9df217d48c50c8bb1f2c8001fffeb85ae5
font_01_sfnt_off0000ef0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0B 18016 bytes
SHA-256: 6b2e8e0e23607f3fbc67c3a44195668cbbfa1131f808e89910e7c728ca7a5d94
font_02_sfnt_off00011d3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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