Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcb56a280472d396…

MALICIOUS

PDF

86.6 KB Created: 2021-07-14 07:31:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7c0f1d9ce7179e182817289871e248a3 SHA-1: 48a49a32b38bee8b395364d7dbba7d797d43f269 SHA-256: bcb56a280472d3964380e493fb5b062bb11163e00b1d4e7ca8e1ba90ff6a51ea
126 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised websites. The PDF document structure and the presence of multiple external URIs suggest an attempt to lure users to malicious sites, likely for phishing or to download further malware. The use of compromised CMS upload storage and disposable hosting for some links indicates a tactic to obscure the true origin and destination of the malicious content.

Machine Learning

  • Nyx PDF Classifier clean score 0.2133

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://allytemp.ru/uplcv?utm_term=pmbok+overview+pdf PDF link annotation
    • http://chinalabware.es/d/files/43976119919.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/zerevesubibetewa.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160852e36b1766---rodogodegivedi.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/58983856119.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/93325286879.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/c83b9f82f43f20db52d6679afdacfc55/nulunatamirusuperatadan.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202105231525276984.pdfIn PDF document text
    • http://architettodrabeni.it/userfiles/files/potigimunefakuxere.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/pisojavaxezilitumenufez.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160cf0d9785b55---zimorala.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16079ad0bf0b25---baduzaviravivef.pdfIn PDF document text
    • https://dolcezzecaffe.it/file/rawugad.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b81e963ee9c---23042287583.pdfIn PDF document text
    • http://tuclubcr.com/campannas/file/60398593776.pdfIn PDF document text
    • https://rajakeempat.com/contents//files/dadesiwuxumanirelewed.pdfIn PDF document text
    • http://bmsorganica.com/userfiles/file/fodagavusogapiwufibaka.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c479e5d22e0---nijilirareperoraxeduno.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1608012858d86e---rofixiruluvejinavowigeki.pdfIn PDF document text
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/ffaaf560ad6c885f92a6cd08c4bfda5c/53864573507.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16071c90d16e94---wobukuvixoxakazidima.pdfIn PDF document text
    • http://rhodeislandalpha.com/clients/56223/File/xurivumaxobevusuze.pdfIn PDF document text
    • https://realschoolspirit.net/scauserfiles/files/5723635916.pdfIn PDF document text
    • https://nabsangram.com/userfiles/file/84829032526.pdfIn PDF document text
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/54440500046.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/31797764060.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_off0000f875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF875 17924 bytes
SHA-256: 804099555599d9eb79e237082c0f7a0d59f1f321bfa04c6b05b0a50b88551419
font_01_sfnt_off0001276e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1276E 10464 bytes
SHA-256: 0a38135176c96d047067e81da46ce779984324c1e48d0f28084f18453b894a4f
font_02_sfnt_off00013f00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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