Malicious PDF — malware analysis report

Static analysis result for SHA-256 0479820a1bfd682c…

MALICIOUS

PDF

71.4 KB Created: 2021-10-11 21:54:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7642485865fb66a945522875c81eeafb SHA-1: a51cfab5a334d92cf46b431de06517175ea6908b SHA-256: 0479820a1bfd682c2ac43d79a8ebfb6bc5582086396d8045a63ca6767eeabcd3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to numerous external URLs, many of which are hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The document's structure and the nature of the linked URLs suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://www.giuseppe.ru/ckfinder/userfiles/files/pedifumeto.pdf In PDF document text
    • http://trevelci.ru/ckfinder/userfiles/files/81408428502.pdfIn PDF document text
    • http://slkuang.com/v15/Upload/file/2021101022338304.pdfIn PDF document text
    • https://armour-technoz-ca.otzol.net/ckfinder/userfiles/files/sovuf.pdfIn PDF document text
    • https://hopclickhospitality.com/scgtest/team-explore/uploads/files/89441032105.pdfIn PDF document text
    • https://lifo-sea.com/ckfinder/userfiles/files/bivuregegaxu.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021092802480573499.pdfIn PDF document text
    • https://capecoralliving.com/media/file/29255154241.pdfIn PDF document text
    • https://texasbordervolunteers.org/userfiles/file/dasamedebupuwunalin.pdfIn PDF document text
    • http://clarklawtexas.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nobaduzekukejebojuxubov.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/jekuxegof.pdfIn PDF document text
    • https://drishtinetcom.in/FCKeditor/file/kikabarego.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/gelilumusa.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16143bfdfcf68b---dawowasugegod.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/mifunewabuju.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///larinunakopekeb.pdfIn PDF document text
    • http://elitakhealing.com/ckfinder/userfiles/files/sinisigajoxo.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/acd26j0cv6aae67scc4c5ks0lg/jupulupudupudeto.pdfIn PDF document text
    • http://joy05.com/_UploadFile/Images/file/40107794664.pdfIn PDF document text
    • http://energcomb.net/cms_enercomb/sgi_userfiles/userfiles/files/5052105180.pdfIn PDF document text
    • http://playeasypiano.com/resources/fck_images/pidugoziti.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143ef03e6479---powijogozafew.pdfIn PDF document text
    • https://estduquebec.com/scripts/php/xenocode/lib/ckfinder/userfiles/files/kenajiwodepubadasafojarim.pdfIn PDF document text
    • http://ivankrivanek.com/userfiles/file/77053222007.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613765f0c8b91---sotavavawir.pdfIn PDF document text
    • http://aotwresort.net/ckfinder/userfiles/files/12075267876.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/896FEnmJZlk/uplcv?utm_term=manual+testing+real+time+examplesPDF 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_off0000b99c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB99C 15176 bytes
SHA-256: e48952f7c025bbf9ecc8ecdaf779103785d124d4b8cb15bc337332a7cd6aba24
font_01_sfnt_off0000df12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF12 10672 bytes
SHA-256: a1c7f81f66fc95379d5bca1bfeb8613572f5d826283875e4c25f4885bc4f6ead
font_02_sfnt_off0000f786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF786 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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