Malicious PDF — malware analysis report

Static analysis result for SHA-256 84024938241387c8…

MALICIOUS

PDF

89.1 KB Created: 2021-06-25 13:55:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f09bf1dab60d8a2b64281b38542ca1b0 SHA-1: 6eb9b248f9c7509995d0a1b6afd9b29a4f85f467 SHA-256: 84024938241387c8b039e954148f0adbe7040978b1e0f4c6873836728d8607a8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external URIs and is identified as a link farm, suggesting its primary purpose is to redirect users to potentially malicious websites. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent. While no scripts were explicitly extracted, the nature of PDF link farms often involves embedded JavaScript to facilitate redirects.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3478

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://cructi.ru/uplcv?utm_term=energy+stored+in+capacitor+is PDF link annotation
    • http://aqbnb.com/uploadfile/file/vijuno.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/ajpgj8233bm6tn2as06cmeog5f/worekuvi.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b640a0be949---52733986666.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/f56146b42e3a73221e4b1c8aefbc60c1/pokijomukadejegoten.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/98659201266.pdfIn PDF document text
    • https://ev-owners.jp/userfiles//files/gotijuvematibo.pdfIn PDF document text
    • http://biosite.ru/images/news/file/xodizovamumigu.pdfIn PDF document text
    • http://garderoba.sk/images/_file/54701711129.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e787770be---rinorafesibujak.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/95b29e1f098099dd96b11c51b7ce0426/nitogomunevosuzilok.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/dcbdt79m1e6kd8thn5k4gmm59v/93491111679.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/5df498b28a33d610aa0bd14b95ce2e49/sipulalijavufijitatavaka.pdfIn PDF document text
    • http://jvcc.cn/ckfinder/userfiles/files/210614182250592108zfmkf.pdfIn PDF document text
    • https://metricgroup.it/uploads/file/vafenagimiguvunadig.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/4u3ednuli6gq74vohnlcnffvv7/25190541927.pdfIn PDF document text
    • http://vietthanhstone.com/images/news/file/89109829012.pdfIn 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_off00010385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10385 10740 bytes
SHA-256: 014bf7e443a34dd707c31e585ce28743076b493092919a5835732e4c185ff3fb
font_01_sfnt_off00011c2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001343d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1343D 17584 bytes
SHA-256: 87614b9b7d7212b2d322bdf5cff086dbf8531557d211185168b1e735bc487e0f

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