Malicious PDF — malware analysis report

Static analysis result for SHA-256 102e8a01ef32c927…

MALICIOUS

PDF

91.4 KB Created: 2021-08-12 00:42:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 728c225f52277baf8a90285a11ab9b91 SHA-1: 3b674f1eda38ad6b9040013e3eb6a5386ed2fd81 SHA-256: 102e8a01ef32c927b74390c6d18ce708e61cce62a3daa3540ab27ed886c421f8
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics point to the PDF acting as a link farm, redirecting users to various websites, some of which appear to be compromised WordPress installations. The embedded URLs suggest an attempt to lure users to external resources, potentially for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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=music+streaming+services+subscribers+2020 PDF link annotation
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/l66fcg06b0qr8qoaqapdtrpagv/runafaxe.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16079e927256d3---73359883562.pdfIn PDF document text
    • http://oodow.cn/upload/file/210720212111397365f9skeb1w09wi.pdfIn PDF document text
    • https://zapcdn.space/web/img/podborky/files/sazikirexe.pdfIn PDF document text
    • http://ri-rm.ru/userfiles/file/topuxajum.pdfIn PDF document text
    • https://tatsolarlight.com/uploads/files/3144087851.pdfIn PDF document text
    • http://au-coeur-du-temps.com/userfiles/file/15182849053.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abb5ad3bcd1---bupulesako.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/vhv92d26gbuqdgkb7nrbq65366/lokotemaj.pdfIn PDF document text
    • https://michelbarbot.com/upload/files/tugilurafudisuxevut.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/b51498d3008da2470fdb536e76705ace/90749648592.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609550b7be636---90711856731.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16111dcffb02e9---55375132342.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2bf07ba86---vofiwijaxitukojatef.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/1bfv6hcnmros6d5cn1ceqvaug2/dufaxukebalozagusotip.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/12a7a8b281dabc1caf54067abc6a1085/kibenoter.pdfIn PDF document text
    • http://baldonimarcostudio.eu/userfiles/files/38678674989.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/57d97f24229b7da91cf8b02e2aa19e86/88590690889.pdfIn PDF document text
    • http://ash-graphy.com/userfiles/file/vutifisejadaxarelefil.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160fd6cf9cade1---15836291672.pdfPDF link annotation
    • https://hgb.se/filer/file/nolikod.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/diwidazujo.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0dbebc4cda---vaxesobuvodewimunop.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_off00010074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10074 17296 bytes
SHA-256: a67a4b420745fdb2911755b10d256a729c85572c7f2c9d6fec897b8d49cbce17
font_01_sfnt_off00012dbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DBB 10948 bytes
SHA-256: c2878e480abb37a1ffca76c19fe337c5d1d1f06f3518621db836974e2c82f478
font_02_sfnt_off00014741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14741 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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