Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d887539b31ba89a…

MALICIOUS

PDF

74.1 KB Created: 2021-07-15 21:22:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e6eb028deb702cef434af63e811a04fb SHA-1: 3b27ae2d591399dda143ee0f88a04deed150c3e4 SHA-256: 0d887539b31ba89a17c77ff0281a231a9b2c85c418cda06ffafec0ec48ef56f1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites. These links form a link farm, a common technique used to distribute malware or redirect users to phishing sites. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4585

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb55334756---mosorurenijazut.pdf In PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae33a96e14---topof.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e68606426d---towofolifonubumafota.pdfIn PDF document text
    • http://tragiaocolamsapa.com/userfiles/image/file/zaturepuvu.pdfIn PDF document text
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/npl3fdec0dm82n53o4rv7lqp72/70807481517.pdfIn PDF document text
    • http://ellerbeefamilyreunion.com/clients/874543/File/39690176751.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d1f589c204a---95527557154.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160906fd208291---kusone.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/xogorimawopijaxiledo.pdfIn PDF document text
    • http://kco.su/userfiles/file/69312044865.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/tixoligozufaf.pdfIn PDF document text
    • http://www.bash.cl/media/file/84535842957.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9e3e5b2e6---wufojabo.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/d3388125a42fc15e2d52f34ba46d2924/394950407.pdfIn PDF document text
    • http://vector-luczak.pl/new/fck_user_files/file/jibivadifemokozonamoboxat.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ce17cb8a8af---22964830518.pdfIn PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/lebepebaliwakuwijobuxidat.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/tobozubeboxenogesewuxuma.pdfIn PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210614_98B28DFB8E5729B1.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/0b35a8cf3ac9937231b8b28ef1af7795/xisakakajalozejijazatopaz.pdfIn PDF document text
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b86f07346bf28f88fa33841b910ffbd1/verovudesugezekusob.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-5-16/20210516211936792064.pdfIn PDF document text
    • https://rotherelectric.com/files/31340093277.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=any+game+hack+apk+downloadPDF link annotation
    • 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_off0000cae6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e2fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2FD 10776 bytes
SHA-256: 9941cad61895c7e447b363d84a8fe9333140c364048dfea407553f7ec75c6271
font_02_sfnt_off0000fb78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB78 16832 bytes
SHA-256: 20f4723cac47728b9834ce620aa410e2f53f69d72bb6e7957afbf664db19f6a9

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