Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e931006f0f3fec5…

MALICIOUS

PDF

93.2 KB Created: 2021-07-01 19:42:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: cfc8e6f8cda58073bf569dc835e5e9ee SHA-1: 080df1bfa2fe0898f550fa863ccae07d544a06d7 SHA-256: 4e931006f0f3fec5323cad496c50ee9a61d6ba34d8763141ed1b1baff99f8046
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm hosted on compromised WordPress sites. While no executable scripts were extracted, the embedded URLs suggest a phishing or malware distribution attempt. The document's structure and numerous links point towards an effort to direct users to external, potentially malicious, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a81bf2a1b38---bokoji.pdf In PDF document text
    • http://fhhsclassof70.com/clients/4/42/42ce21dc30e429aa976ba070b22ccf93/File/43916392143.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-11/20210511185650575242.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078f4d44551d---kegagewexusupuzukurulum.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/850n8qj22i637ct8remfon8td9/33517998183.pdfIn PDF document text
    • http://africa-emergence2019.com/userfiles/file/56873359587.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/60015082001.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/4e7ab3a53bb21a251ec8c1daf74cad05/4030297209.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/42405095539.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/gepasduod5it3cga0g0c24v2nl/pilowiluvironigi.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/uamtk0hbnii41ts9iscet38u6j/wojixojikovumageza.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/f2ee74d9fccc52f4e50ca3b2a8ed83fe/79680420977.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1606e511c510ba---15364012836.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/fiwekodobuli.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/135df48e05d15b55c662e7731bef2b7a/jijogosazezona.pdfIn PDF document text
    • http://liddellgaryfamily.com/clients/863293/File/mibejasizugibefabuvoliz.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/4d5a28de8a3edb8093a7b78d72b85e07/rametuniful.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160942950de6ca---jerivujenima.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/74760248311.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/d5df52b370871845cf582bab4d6836c5/gigaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=r+kelly+to+the+homies+we+lost+mp3+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000e786.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xE786 19024 bytes
SHA-256: 84745cdf2aecbeb4cb356199cf8ac17ec31e816fd04edf1bab036284a5fbf3da
font_01_sfnt_off0001065a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1065A 11064 bytes
SHA-256: c7320b204f68313a4019c034598aac40847bc1481f9693a8154532e670d598c1
font_02_sfnt_off0001200d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1200D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001381f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1381F 17708 bytes
SHA-256: 20e50976e7f758e72ec7df81356631fcd18845978d14b1729f7ad7138e9a5c53

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