Malicious PDF — malware analysis report

Static analysis result for SHA-256 724685accb58ff1a…

MALICIOUS

PDF

85.5 KB Created: 2021-09-09 03:27:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8284bcd0e5878645e3c73f54471261fc SHA-1: 984dd9c42c0404dfe6374b29647bb69cd650ce34 SHA-256: 724685accb58ff1a9258d757276162703eeff36410c58ab849f11213a57ac9e7
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm or SEO poisoning attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://kirakuramen.com/uploads/files/38164871739.pdf In PDF document text
    • http://fotografieindex.nl/images/uploads/xepujojuxakope.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613523116a318---75159240181.pdfIn PDF document text
    • https://tarzminder.com/resimler/files/zodiregesofusojoji.pdfIn PDF document text
    • https://beta.nhatthiengroup.com/files/uploaded/files/56022986709.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/64808143474.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/lezeposonizipiduxo.pdfIn PDF document text
    • http://pro-elec.ru/ckfinder/userfiles/files/fafod.pdfIn PDF document text
    • http://www.ville-dammarie.com/ckfinder/userfiles/files/zilazigawo.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/13865876901.pdfIn PDF document text
    • https://nakshistudio.com/ckfinder/userfiles/files/31923861334.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16132369696f12---pisukabir.pdfIn PDF document text
    • http://recko.ru/ckfinder/userfiles/files/netefisagasa.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/2b87032c82c9155a249e8f42b2a5b832/40940591622.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/73028789651.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/88862850063.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/41434098780.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/c973fc8eff937816605954708c2b979c/87395952976.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613429db629ca---lanejiresofuwolov.pdfIn PDF document text
    • https://tsegypt.com/file/topativot.pdfIn PDF document text
    • http://vizit-k.net/uploads/editor/files/16075169495.pdfIn PDF document text
    • https://thietbixanh.net/uploads/files/99631491991.pdfIn PDF document text
    • http://www.vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/92225667809.pdfIn PDF document text
    • http://gr-chem.com/upload/files/vixuzizo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=gta+4+download+android+100mbPDF 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_off0000eac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC4 10624 bytes
SHA-256: 4dfe93598056214cd5ae84e90f78809f9e44486f96ba6fa90196444eaca2a4a9
font_01_sfnt_off0001031b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1031B 17604 bytes
SHA-256: 87129f9109fbdd6cfa95c7991eb546973704d2adc7ee9553008399ae7e22c722
font_02_sfnt_off0001303d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1303D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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