Malicious PDF — malware analysis report

Static analysis result for SHA-256 d98fd719b46926b5…

MALICIOUS

PDF

70.7 KB Created: 2021-09-16 11:52:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9eb0282a7566f42d6d51d1c09ffde903 SHA-1: 664056bd508f02b1b98c10d7a7f647508ace0526 SHA-256: d98fd719b46926b52e13723c7d7505c39af5d3fbe000073d228851771369924f
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is unreadable, but the heuristics and URL analysis strongly indicate a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://myepres.com/HotelEstimator/userfiles/file/wibopomegawelanip.pdf In PDF document text
    • https://rainbowfurnitures.com/files/files/jofixawemaxosisigo.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/1f93005bb298f4fe0411b61fcb636600/selilabexenaborasesajinab.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613097a773ae8---vudedaratofarigoxure.pdfIn PDF document text
    • http://1night2day.com/ckupload/files/xanonikufi.pdfIn PDF document text
    • https://psychotherapie-coeppicus.ch/upload/file/50470902552.pdfIn PDF document text
    • http://cimkezes.hu/uploads/ckfinder/userfiles/files/37204652076.pdfIn PDF document text
    • https://ceiling.holcom.vn/webroot/img/files/56714132433.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/39636442426.pdfIn PDF document text
    • http://spzpoz-zdunskawola.pl/upload/file/pumetipafewemaroxiwogev.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-9-6/20210906014719601942.pdfIn PDF document text
    • https://robindayne.com/ckfinder/userfiles/files/novizifomolufedukezonod.pdfIn PDF document text
    • http://lidaoxc.com/upload/files/wajugowi.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161328d1e4950b---kazanupebuniwisarotujotaz.pdfIn PDF document text
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/loneditiwipuki.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/kapudiw.pdfIn PDF document text
    • https://hr-serdahel.hu/images/file/saxexafuta.pdfIn PDF document text
    • http://dogomanhnghia.com/uploads/files/53594415070.pdfIn PDF document text
    • https://un7un9b3rl1pa7-99.com/contents/files/zikesef.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/72890792795.pdfIn PDF document text
    • http://uralinteh.com/uploads/files/85294774417.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/e1677151bdc1159ca943c8ca4f0a95e9/10163375679.pdfIn PDF document text
    • https://handientu.vn/userfiles/file/62493580272.pdfIn PDF document text
    • http://baheth24cars.com/ckfinder/userfiles/files/83521962679.pdfIn PDF document text
    • https://www.geya99.com/ckfinder/userfiles/files/63052244983.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=add+audio+to+video+converter+onlinePDF 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_off0000b6b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6B2 15080 bytes
SHA-256: a1b9d062cba1e076902f72198dd898f245f2ca0993c43c4b3d4ffa6bb360231c
font_01_sfnt_off0000dd18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD18 10340 bytes
SHA-256: 790649a3f83dbf07b1a3c54018b1c49b76e15a8212efb1c2b3d6e4062d73a839
font_02_sfnt_off0000f491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF491 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1