Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc1b31834b82428c…

MALICIOUS

PDF

83.4 KB Created: 2021-09-04 19:08:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 25efe5cb24940747f249141a2a920f68 SHA-1: 23f5286a8beada3f623b2c9afdf2a9974c78bcdf SHA-256: fc1b31834b82428cb4b5e5ae4a9a3db333181426d311e821f1a1c8f93b87cc54
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised WordPress installations, indicating a link farm designed for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://philabc.ru/uplcv?utm_term=blomberg+dryer+service+manual PDF link annotation
    • http://cutyoursupport.com/userfiles/file/sudapefizibitawekuru.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/jopowufurudek.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16081c50df2529---sizaxajeluditerobasij.pdfIn PDF document text
    • https://nusantarabet4d1.com/contents/files/77271585850.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/gulabukafizalo.pdfIn PDF document text
    • http://greenearthgardens.org/userfiles/jebirujagonirekikube.pdfIn PDF document text
    • https://fanaf.comarticle_ressources/file/dokuxarakumivixoxe.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160946e217e630---jiduxuwuzuvafavarudajofif.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210617014412.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/fajikiz.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/da7e75f03d7032af1a66b960b13409d7/66220857713.pdfIn PDF document text
    • https://yuktogel.com/contents//files/63318105989.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b92f001f506---14302465801.pdfIn PDF document text
    • http://www.valaisconsulting.ch/file/17478452267.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1610656d3be447---xaragapufazobenobunix.pdfIn PDF document text
    • https://bacninhonline.com/webroot/img/files/41421127093.pdfIn PDF document text
    • http://tlumacz-francuskiego.pl/userfiles/file/pigezapefavaberuvelonol.pdfIn PDF document text
    • https://olterus.info/contents/files/mezogelovizexite.pdfIn PDF document text
    • http://fratellibeninca.com/images/file/37904781063.pdfIn PDF document text
    • http://globalsocialwlefaresummit.com/app/webroot/uploads/ckuploads/files/fojowobeboxasevelijazozu.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/fd37a697572b1efe3e07ab4a04fdf63f/kunonesitusenag.pdfIn PDF document text
    • https://qpshouse.com/upload/image/file/59795725480.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160852f2487440---27517120993.pdfIn PDF document text
    • 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_off0000d7d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D3 21108 bytes
SHA-256: 8c7d18395f0ead21b2ff44f9f0b6c6166ac840a15c58cf5276e42ebb7615982b
font_01_sfnt_off00010ec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126DE 11088 bytes
SHA-256: 2da3ee50462a6559c870e8b5a18d4c3cb9bbce2cea93f21188fa6f4fb390bf54

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