Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f30a8394c86df1b…

MALICIOUS

PDF

92.7 KB Created: 2021-07-25 07:50:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2947cfc4ccbe5fe3506b60e20bb320a9 SHA-1: fb3c9a134b99290c06e2ebc1cd44a520319387a2 SHA-256: 8f30a8394c86df1b59b40200566777a78354dee270d428e3c97c17626f425ca3
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to host and distribute malicious files. The ClamAV detection and ML classifier strongly indicate malicious content, likely a phishing or trojan payload. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further support the attack pattern of luring users to download malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec98989945---50692566218.pdf In PDF document text
    • http://fecirturizm.com/resimler/files/wipewugesulexuvekepesuni.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/87954414206.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b811e9e88ce---51732878997.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/93641725198.pdfIn PDF document text
    • https://www.apollopowersystems.com/wp-content/plugins/super-forms/uploads/php/files/4ea8b7437a0fb245329d4e2c694ab93e/96407707551.pdfIn PDF document text
    • https://tims.ro/ckfinder/userfiles/files/98346683266.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/37298300376.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/81482745331.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/baxamererolaroligabilu.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16201780026371.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/41202189153.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16077f0d6c00c5---fobujatujuraxuvu.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/bajevutalo.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2eeffb1d5a396576df61e5bf32b418f0/wuzazetiwojebamefatedu.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1609431de70ad4---kudafom.pdfPDF link annotation
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/cdd4frhihe7gc45jr781kq6f6k/kusekurudedudafik.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e4eb90befe4---88416831731.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa749196eb3---23505160987.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/jubutafexa.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ddf4a292032---wutag.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d27d4c3078---78105554949.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/bf4fccfb8de92b215728c3c55d7f11e3/44729183167.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e96d56274---davuf.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/xivikijodel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=ejercicios+gerundio+e+infinitivo+ingles+bachillerato+resueltos+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_off000100e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E1 18252 bytes
SHA-256: 6fc01e29c013cdb2d7ead29936b8c2ae288b464614784b11c7258b35fc49d4f7
font_01_sfnt_off00012f6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14783 11320 bytes
SHA-256: edb7f76dbbb0cdcc790ff6450d8759bdde66547a3daf20da44f499c3bf2ad756

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