Malicious PDF — malware analysis report

Static analysis result for SHA-256 2108781775d58e95…

MALICIOUS

PDF

71.4 KB Created: 2021-06-10 12:22:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 9369b2168cd25eeca13d8d837ad1c9e1 SHA-1: 78bf11d4f5a8771e81c32123dc767c431327ec1f SHA-256: 2108781775d58e950caf2627ab6ac626e4a66b4bac2f7b0456330b20b280153e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting it functions as a link farm for phishing or malware distribution. The presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious content, likely disguised as search results for popular topics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://archism.ru/uplcv?utm_term=beyblade+burst+season+2+online PDF link annotation
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/to651ka97g2dajpsqm949tbi0r/95644705220.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/19fd2d1d78f7966d3ffac7eb8568864c/37863622010.pdfIn PDF document text
    • http://officinedesign.it/userfiles/files/31879462013.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/c6gedlttk9hd79hjjfblfjr6k4/41790204407.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/9571ebe68e7aaaf54ebdc105467a1185/80997077108.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16080e10cc91d8---92955770064.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088b75146178---68556302808.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e4a0374e54---67014541563.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/aa4ee79ecd84e516a166eeb822763c0d/63281180451.pdfIn PDF document text
    • http://premium-h.info/files/files/8404655654.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/74694502198.pdfIn PDF document text
    • https://666666.vn/upload/fck/file/82435183869.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9a8deb5dc---wovofuzigotuvuwekefijijis.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/tuxozigovuka.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1ab954673---mexolaxugijazotekafureme.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/25437502003.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c9b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B0 4284 bytes
SHA-256: 69c86f7825367ab7c6c9da65aecd58ec1a1410bba0205298251e462705353476
font_01_sfnt_off0000d8b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B5 5244 bytes
SHA-256: 1e6a382fcb665b804604d35eb2c846548983a5e76dfc641619731ecffbfb0793
font_02_sfnt_off0000ea99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA99 11656 bytes
SHA-256: b1ac694fa637158c96de300b6016a6190ade54f09330481af4a588722e094d26