Malicious PDF — malware analysis report

Static analysis result for SHA-256 e592fbd37f2a5c57…

MALICIOUS

PDF

85.5 KB Created: 2021-07-20 23:24:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d7dd1c013820f42bbca2bbc066f38f74 SHA-1: d6d1c1d7924340e6947154b2654b6b74bb9a9e20 SHA-256: e592fbd37f2a5c578352718d894568eaf2a9a267af6ca5286c7f7937a1d43384
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple distinct hosts and the use of 'utm_term' parameters in some URLs further support the link farm and potential SEO manipulation for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://candientu24h.vn/webroot/img/files/gekozogip.pdf In PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/a63d039a1ea7ee95cbbc3a7030a1a6c7/sevusalitiserisixafiw.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/d70a82a597cc7c71196d39c79f8fa9c2/bujesazuzun.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/0f746f6ee67ec36cc5f923217c04e3af/70108850856.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/16096311fda984---19962184067.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/69342eb2ef173ec0b3a06632dfd3aecd/41212568065.pdfIn PDF document text
    • https://citronixdeflection.com/nbloom/fckuploads/file/88076517023.pdfIn PDF document text
    • http://sankofalectureseries.com/clients/a/ae/ae3037074ff26ae8502dacd236f4ced8/File/74887096263.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b3821e07fba---sorapopajugifezevewure.pdfIn PDF document text
    • http://frankslawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/90864802059.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/78075967603.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/wawerenavogotuviz.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/8fqqnvpd2ltrkud3eo2jkd84ti/70962888725.pdfIn PDF document text
    • http://trendymamy.pl/userfiles/file/tadudefigimomipejumo.pdfIn PDF document text
    • http://petersonspann.com/clients/3/32/32c4b2f41fa698b5b938e848169c8dcb/File/furebujolajuvuf.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/jotesujubimezi.pdfIn PDF document text
    • https://nic-irq.com/userfiles/files/83085019433.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16075bd2e61263---52346846375.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/64689ee5101d0ef8c5441abb8f0ed4fc/2157267990.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/mijeneduxujira.pdfIn PDF document text
    • http://areaengineeringsrl.eu/userfiles/files/volusosedas.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/32649213667.pdfIn PDF document text
    • https://propiedades.net/ckfinder/userfiles/files/vusugamapuvevoxukozuni.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e44f2e73e---72772465491.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/f699d899eab44283c9115300c89e542c/47764025227.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=corporate+accounting+2+book+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_off0000ec6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6F 11064 bytes
SHA-256: 33771d4c1d05c1f6016dc7085a0a0e402464b0947c47eb9ec376941365c4c20b
font_01_sfnt_off000105f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F9 16528 bytes
SHA-256: 0de0db2917986fd1aaad20f935b4e6a5d1da4366d057a9e713ee07afd5b3b5f8
font_02_sfnt_off00013091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13091 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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