Malicious PDF — malware analysis report

Static analysis result for SHA-256 caa553cbef3b5581…

MALICIOUS

PDF

80.9 KB Created: 2021-07-20 04:47:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 966c915b6226c9a2727fcc318049e2ab SHA-1: 1ce88ae700bcd5fb11c570153fbeb8cf037f06c3 SHA-256: caa553cbef3b5581bcb8f0791fd53bd437b86966375be8cf5a9388d105e88d29
164 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised websites, suggesting an attempt to trick users into downloading files. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The presence of numerous unknown URLs associated with compromised CMS uploads reinforces the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 7

  • 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.
  • 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 http://miryangpension.com/FileData/ckfinder/files/20210708_395897F8B122CBE8.pdf In PDF document text
    • http://hasici-pristroje-eshop.cz/files/file/pigugoda.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609637131b7f2---19493695550.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097d5a667f38---pojufarejufunenewovuxure.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093ca2f5e467---18689532822.pdfIn PDF document text
    • http://edgecs.net/documents/28037508932.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/8906fade97ae4a3b5bde02e50320bf27/jexugowolifijinixod.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/jusapoxizewaxe.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd3f755fbd---lejesobuwavugogiba.pdfIn PDF document text
    • http://librojuridico.com/aym_images/files/26303925608.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee1b38dbb0---9475185763.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d42d2a4b0ed---wuzifajolakiwi.pdfIn PDF document text
    • http://distributoram.com/files/file/98978089844.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608a82b8139b5---dafusanubixariw.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/6431f842f5863eaa015f6e465640de8f/ditigovope.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9cff0f2f40---bisilopuripunilavenol.pdfIn PDF document text
    • http://abpaluso.com/upload/file/ferudurovimenug.pdfIn PDF document text
    • http://penney1970.com/clients/7/74/747debde904cce1d9d58e62e9103e361/File/renewipunifefaxipez.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7f55aa495---20159664292.pdfIn PDF document text
    • https://dwitunggaljaya.com/sitefiles/file/52328916403.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0f293b506---muwuzixupipibiz.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/301456b483843b4eded1c428f1241af8/suduxofiri.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/67028375203.pdfIn PDF document text
    • http://allasclub.com/campannas/file/zimibidawofafem.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/vekalafuxaw.pdfIn PDF document text
    • https://livredart.com/ckfinder/userfiles/files/76461257719.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/7097831136.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=unitrans+learnership+for+code+14+driversPDF 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_off0000da4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4D 10920 bytes
SHA-256: 049c72b8e418fdd19a737e5286961b2fd5e4073a1b517be37696f516ced38cde
font_01_sfnt_off0000f39d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39D 16248 bytes
SHA-256: 8ecdad061db98ce490103d260e41b328cc693748bf3572ced8d541eb31d8a336
font_02_sfnt_off00011de4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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