Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d8c275eaa14df36…

MALICIOUS

PDF

86.6 KB Created: 2021-09-02 09:28:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 278f7bcd02e07e15dc913ad36cc3b16e SHA-1: 9f6b20325aa9a5eb037d2b247ed3c6d401fda295 SHA-256: 9d8c275eaa14df36199ce0ec4e59e931c596427bbefe2b68333b8c3c3b0fe335
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was 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 compromised WordPress sites hosting other PDF files. The presence of these links suggests an attempt to distribute malware or conduct phishing by luring users to malicious content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5fc571cad306fddddc77c60e84b813bf/mebunevuriranusename.pdf In PDF document text
    • http://ballmillfactory.com/d/files/paliwivedifoka.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611f713e5ec73---bizukodasokekipilivufug.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/sidik.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/94ff44d8833ed73043324e655e69b8bd/82889230990.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c30a767a709---97491084484.pdfIn PDF document text
    • http://improntediteatro.it/userfiles/files/xubatexetovu.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/godugu.pdfIn PDF document text
    • http://sangiorgioautoservizi.com/userfiles/files/81807661943.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160f8a4558b264---xurag.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/pijurisibemorit.pdfIn PDF document text
    • http://hghs61.com/clients/9/98/9814c5f28b4e93efd1f74733a9fd6b0f/File/pujuparoviwo.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c60bc644cd0---zusesomaku.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/xurosuzasi.pdfIn PDF document text
    • http://vakoplus.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/nonoregitoludasidus.pdfIn PDF document text
    • http://mclarenquartz.in/ci/userfiles/files/23358940940.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dce288e5274---fepenadotepawibim.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/luvonuverok.pdfIn PDF document text
    • https://die-elke.de/cms/elke_page_files/file/31257569899.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1676eb0b17---notowemapuwi.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b64881d74---sofusimole.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/risinixusixeto.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/01c37e6fc4ab013b013abdb65c857a07/nuginidutiferozegerep.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/24460193173.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=england+football+quiz+questions+and+answersPDF 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_off0000ec6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6A 11044 bytes
SHA-256: 86abc836c31691877379a09dbff51d778f096bde4651c4accf3bbc915b952e53
font_01_sfnt_off000105d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D2 17916 bytes
SHA-256: 73f749bf646f5f0acd733a6087f96152b69c034fb8264d971a87b28f51530295
font_02_sfnt_off000134a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1