Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd5432ffa6b8e24a…

MALICIOUS

PDF

83.9 KB Created: 2021-09-05 22:50:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c08f9b820d58381354b5225535c9b11b SHA-1: 5d72184a53d4815cc7ad8ab148eddc431d70f18d SHA-256: cd5432ffa6b8e24a7e2123e23bc62e2ff03c7784b08f7c89fab97ddefb32d8cd
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to various domains, many of which appear to be disposable or compromised, suggesting a link farm or phishing operation. The PDF structure and the presence of multiple links on potentially compromised CMS uploads further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • 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.
  • 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://krr-nfe.com/suratnfe/UserFiles/File/36115884589.pdf In PDF document text
    • http://sns-russia.ru/userfiles/file/xixapebawesuzomelaka.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b647591fe22---dupaz.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607e385c3328b---76647053273.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccf09ccb334---tirekimudesebar.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/06oe1jjlqpkb5h47sogtt3tq1j/41459049678.pdfIn PDF document text
    • http://diodelumi.com/ckfinder/userfiles/files/kovupagogepajobifijosatod.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/2c9b6797e3f140e51457fa8fbf109aae/vojazefubefi.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16073584088729---72913123589.pdfIn PDF document text
    • http://hongdacable.com/d/files/24030825866.pdfIn PDF document text
    • https://5a.ro/ckfinder/userfiles/files/12848638124.pdfIn PDF document text
    • http://fitviewer.biz/files/file/83638118278.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/36214766232.pdfIn PDF document text
    • https://olterus.net/contents//files/83350565845.pdfIn PDF document text
    • https://dafelia.com/files/gazibusoma.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdadc32af4---xofedijisuro.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfa3fef091---18332463510.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/r4mf4s3vgsjvm8lj7ukinarp02/8229752268.pdfIn PDF document text
    • https://casabresciani.it/uploads/file/tujiwovefokoni.pdfIn PDF document text
    • https://chptravel.ir/data/file/jipolowukexejanotodemure.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/cescf481r1gta00v393rns09lq/84028624183.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/difaxut.pdfIn PDF document text
    • http://thepokeluau.com/uploads/files/54476429662.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609be7d2b33d0---dolonubujemofidipijof.pdfIn PDF document text
    • http://splogservice.ru/content/file/kosumewowexurikoriwezudet.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/e7369ba0ff6fc34f3146de0f69af7fb3/gupizifirepofuzijelita.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=pioneer+z9250bt+manualPDF 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_off0000dda4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA4 19588 bytes
SHA-256: 13226f3ef21c8a3a50c36a85c8ff68eba6850212fda4f4fa33ce06d5856541e2
font_01_sfnt_off00011061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11061 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12878 10944 bytes
SHA-256: 77439805ab6942b7403767f53fcc8a1b309c7a1ea417ff43b37202947bd3c9cb

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