Malicious PDF — malware analysis report

Static analysis result for SHA-256 76636c4860b5ff80…

MALICIOUS

PDF

83.2 KB Created: 2021-09-10 20:04:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d82135d47dad19a37d62b5b1c375a030 SHA-1: a4429e3dca1690d90c29bae5ae50d267a8e165f0 SHA-256: 76636c4860b5ff80bfaff2d15e2517466e6e34d5aa259d2e440a1294bf5b9f66
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://tutek.eu/userfiles/file/47648192261.pdf In PDF document text
    • http://assushop.com/userfiles/assushop.com/file/43725746466.pdfIn PDF document text
    • http://kasand.com/userfiles/61234597180.pdfIn PDF document text
    • http://khonggianmang.com/upload/files/16801870954.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/161396a361e128---zegenotafepidosilefari.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132f36e35f68---73117287382.pdfIn PDF document text
    • http://vuatoyen.com/uploads/userfiles/file/51831063103.pdfIn PDF document text
    • http://magic-mugs-factory.com/uploadfile/files/tupuxako.pdfIn PDF document text
    • http://synfarm.com/upload/files/jazexarosamogakuzud.pdfIn PDF document text
    • http://tnshoppingbag.com/upfiles/file/26627819666.pdfIn PDF document text
    • http://kronospan-mofa.hu/editor_up/wekevijirotizolozexufumad.pdfIn PDF document text
    • https://marcvandewiele.com/userfiles/file/17440493710.pdfIn PDF document text
    • https://ka-base.no/images_content/file/84905163354.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/xevupivojokamanoso.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210910_021F3C7E6BCFEB68.pdfIn PDF document text
    • http://dastone.ru/userfiles/file/basebanap.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac8bea90ea---10440058021.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/josuputinasosajuno.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210903130452932.pdfIn PDF document text
    • http://avesta-hmora.boj.se/uploads/userfiles/files/6434393241.pdfIn PDF document text
    • https://aarhuskortet.dk/images/file/xumokojap.pdfIn PDF document text
    • http://american-security-inc.com/assets/ckfinder/userfiles/files/vojuvomadelup.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161383fef608f7---gobuvefusode.pdfIn PDF document text
    • http://idealhca.com/admin/images/file/65762995108.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=art+of+war+online+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_off0000dfa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA5 10388 bytes
SHA-256: 6c78a89c803ae2fab7b99ed36e77ec58ea298e00484fc93d38cb82f6f90dffe5
font_01_sfnt_off0000f74a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74A 18308 bytes
SHA-256: f2156885cdb7af3da5d227ac80967b54f8c6c2f364b11e539dc6e9a449dbe6c5
font_02_sfnt_off00012795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12795 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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