Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcffc6edf645aab7…

MALICIOUS

PDF

84.3 KB Created: 2021-09-02 01:19:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5cb4c51814794872db03ecc843a86295 SHA-1: 3a893c7ddfcf7cbd3a9cfa92928a275dc00f075f SHA-256: bcffc6edf645aab780610d1d72b39e52865af024cacc2e76775d03e04dab593f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a link farm. It contains numerous URLs pointing to compromised or disposable domains, suggesting an attempt to redirect users to malicious sites for phishing or malware delivery. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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://superpart.com/files/norizavukavivileberuvu.pdf In PDF document text
    • http://zgkimsteszew.pl/img/upload/files/jiwebutaramoduxekisalox.pdfIn PDF document text
    • https://internationalmedia.com/userfiles/file/sudarigib.pdfIn PDF document text
    • http://suliaox.com/v15/Upload/file/20218524101561.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8375a413d1---99436148628.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16088eae1040f2---detusomajixuposolabeloto.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/22693926405.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/httplsbp92latafeuneccbc49a/91816164050.pdfIn PDF document text
    • http://adveotec.com/img/file/41590575518.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/50240556958.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/0bcc0d88727d28b1fe61bb6700259bda/tiwaxabanipuvadaw.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/u5cnvpntmmmbgrnn459j5qm5lr/vajikapufuvog.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/5840152549.pdfIn PDF document text
    • http://dream-mebel.com/pic/file/49367379154.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/78b08e96d6909e2ada4a8bf0b982afe1/jekasuvarotixetofo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088963b61a63---80438051601.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c581071fc31---49241484444.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/doxulasoxan.pdfIn PDF document text
    • http://masseydogs.com/clients/f/fc/fc2e217ffa4851e49ca3cd921a15cf41/File/romesebevavoselomewerik.pdfIn PDF document text
    • http://mpwlawpa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pakur.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160cd2bf87642e---5078114438.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f414044ff4e---98858654421.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071891a095de---29816081408.pdfIn PDF document text
    • http://traviet36.com/upload/files/puwifuxusoneb.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/bavobol.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160909ea86aa1a---rosolasojisopope.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba1a02976f6---vetavowibaje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=bmi+calculator+for+11+year+oldPDF 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_off0000e2da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DA 10684 bytes
SHA-256: df2cd09b08749166520125f31d2584193b2a362afde3a4dae59047a3c58e7a7f
font_01_sfnt_off0000fb7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7C 18228 bytes
SHA-256: fabbe1c015b89a2b426ca147686dc245c68d0de04f8ede61a901ce3d16635181
font_02_sfnt_off00012a8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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