Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8e5b5edae0dae77…

MALICIOUS

PDF

71.6 KB Created: 2021-06-26 23:28:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e3af3bc761151f2da3c7c4db464af2da SHA-1: bd699e701fa0ee51c18c6407bb3204d5be219147 SHA-256: a8e5b5edae0dae7767c3478428d8e42bb8c254e895d66a49a019abad7d6a1959
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary purpose appears to be directing users to potentially malicious content hosted on these compromised sites, fitting the pattern of a link farm used for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/864vrssrlmfotb2ueh8gvue4od/pamujikasipesifax.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609250dfdec50---deboredotupexenomu.pdf
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606e313ce8ba0---14628245622.pdf
    • http://kovacsoltvaskerites.hu/images/file/varivazemesu.pdf
    • https://cursosgratuitosonline.es/wp-content/plugins/super-forms/uploads/php/files/q5dhtq5tuaq16t376nq618dgqo/zilafexagu.pdf
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/a3oa305mpo1r8o98n9ipu5rmug/leforenobusipa.pdf
    • https://aplusadvance.com/naver_editor/data/file/fukuguf.pdf
    • https://aimhc.com/userfiles/file/41619393504.pdf
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/1c5f8ef0b4d66a678f60be10295e3be1/69593904842.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/b2nard9e9vqb4gi8kqre3m05a3/69280314162.pdf
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609681e087d9d---84919110476.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e998d2a012---ligamekapevonida.pdf
    • http://biotop-zamosc.pl/userfiles/file/jiseguwowelewan.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e3886291b---sumejow.pdf
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cc13dc1b813---jaxur.pdf
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160bff916f1a0b---vebosisewet.pdf
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160786c08a8abd---tefokojunawudop.pdf
    • https://kultmotor.hu/images/files/21253761727.pdf
    • https://bluza-shop.ru/content/File/68173787813.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2a4a0b3848---mowelukabiwixile.pdf
    • http://ghhs1968.com/clients/5/57/5762190d0a265df614d1f295a7060a42/File/todisutuzu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=the+eternal+palace+we+can+make+it+stronger
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b544.bin
fe2f88d18c97976a0c7d5c84141dbb835e8fec26b0594d949b3fc4fab62f1215
pdf-font-stream PDF embedded font (sfnt) at offset 0xB544 16332 bytes
font_01_sfnt_off0000dfa3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA3 16792 bytes
font_02_sfnt_off0000f7ba.bin
b75434750c24d9db24c9bed247623113f92ff713a2c1c6f9489d85e2970c134d
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BA 10960 bytes