Malicious PDF — malware analysis report

Static analysis result for SHA-256 eeb697a9b86aafe8…

MALICIOUS

PDF

81.3 KB Created: 2021-09-09 07:46:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c6168ee8a983f49f03c642733db82c46 SHA-1: 12644f0c653ef9a789b53887a2535044b47447fa SHA-256: eeb697a9b86aafe81ecd3d074746cdb29f146d97f8c59672d0e398f212c88be6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://palami.by/images/file/58180648650.pdf In PDF document text
    • http://mptech.vn/ckfinder/userfiles/files/dejozuwule.pdfIn PDF document text
    • https://funcarele.com/ckfinder/userfiles/files/gukirenidagopexi.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/11371753990.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/k0d5hm2mv7rof4b1lbiam99t62/xulaxozirew.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/20486132931.pdfIn PDF document text
    • http://alrabbanoilandgas.com/file/files/kisosataxozupuxajiluzi.pdfIn PDF document text
    • http://sluchatka-shop.cz/files/upload/files/67125411801.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/b5039d23837f9883341e02f05fb1740b/xigepezexexonebubobetafer.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/peromelapilenurawab.pdfIn PDF document text
    • http://debnine.net/UserFiles/File/16913807373.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/50469113299.pdfIn PDF document text
    • https://sofanet.ro/ckfinder/userfiles/files/40397173155.pdfIn PDF document text
    • https://eltonltd.ru/sites/default/files/uploads/49602669563.pdfIn PDF document text
    • https://ruxthai.com/ckfinder/userfiles/files/4173514806.pdfIn PDF document text
    • https://pellevah.com/upload/files/pisagisogijurobumoregawa.pdfIn PDF document text
    • https://www.gico.ge/ckfinder/userfiles/files/85586069929.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/neronaren.pdfIn PDF document text
    • http://sushi-belovo.ru/files/vilolobotiv.pdfIn PDF document text
    • http://koyomisushi.com/uploads/files/miwixuzinibomopa.pdfIn PDF document text
    • http://morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613627eb5cec6---21394437911.pdfIn PDF document text
    • https://congchungnguyenlieu.vnpec.xyz/uploads/files/69462202040.pdfIn PDF document text
    • http://travelspace.pl/userfiles/file/goxalibexizejesibebor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=past+perfect+board+game+pdfPDF 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_off0000da2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f241.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF241 10864 bytes
SHA-256: c331ffe35c44e77b6dd63c4498eb64e0e609e5ffc9b8271c96571c9bbdbee2ce
font_02_sfnt_off00010afc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AFC 17508 bytes
SHA-256: 78eaf464e2dd86be024f8cad7e689afb563d90ca6043457b63eb5c45a9588599

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