Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fc29785fd8b343a…

MALICIOUS

PDF

85.4 KB Created: 2021-08-12 05:04:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d9f4c52e8e8c034b77a858c85deb22b3 SHA-1: d4ffbd69efcea1b92c6c4882199f2cc1eca00caf SHA-256: 0fc29785fd8b343a9b86c7d1a14d0db1e88de5708555caa827282168ed50fb7a
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various websites, many of which are hosted on compromised WordPress installations or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or SEO spam. The document body is heavily obfuscated and does not provide direct user-facing text, but the heuristic firings clearly identify the link farm nature of the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://sayurhijau.com/contents//files/27960058032.pdf In PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/97e3b63ed31abbe71b69d87c2b085134/94349630631.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/61345f1f06d1d430319c034552619ead/38268914807.pdfIn PDF document text
    • http://1yunnan.com/ckfinder/userfiles/files/66007498051.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/53431574887.pdfIn PDF document text
    • http://salukool.ee/upload/userfiles/file/jezuwebufupisis.pdfIn PDF document text
    • http://shesob.com/file/files/biboretatenagerusok.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/6f3e2de1c7e0e50136f939f9ad005f35/kotobojaxovezatopigapupuj.pdfIn PDF document text
    • http://doctour.hu/uploads/ckfinder/userfiles/files/putojukusaposovovixate.pdfIn PDF document text
    • http://osmed.cz/app/webroot/files/files/69725004165.pdfIn PDF document text
    • http://laweasy.kr/userfiles/file/nejumivuzapurini.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe59e37514e---wozigelepetuvopala.pdfIn PDF document text
    • http://hyperasp.net/userfiles/file/35965466301.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/6402669274cf88814fbc25d939c2fb89/susuzedanivaxenow.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6c511a8e76---87501857766.pdfIn PDF document text
    • http://bbmeti.it/userfiles/files/94233505769.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/d54c71ee7426079d9f721b3833a7f667/33588996863.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-7/file/84650026557.pdfIn PDF document text
    • http://emirates-offshore.com/uploads/image/file/xajixinobajigu.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/baketigewofuziregeki.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/memezojulorudexava.pdfIn PDF document text
    • http://lamachine.nl/userfiles/file/42903755630.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/eb65n2n22nt8ab8bhr5o7opi80/10331270696.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=calzado+de+guantes+t%C3%A9cnica+cerrada+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_off0000e59d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE59D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fdaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDAF 18164 bytes
SHA-256: 44e9cc88f8c00c0fdbc97db4bb66159400ad251ec20451585329d12435a54cd8
font_02_sfnt_off00012c1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C1E 11140 bytes
SHA-256: e629d043e68ff98a0c7cc6eac6b447a9a9a403e99ac964a30150f335d5a12bb3

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