Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7bb3e0e97b48f3c…

MALICIOUS

PDF

85.1 KB Created: 2021-09-04 20:44:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 763b92123daa4262573caed725d7968b SHA-1: 7ed96ce0d1df683bc83d88941c865075e5b400a4 SHA-256: b7bb3e0e97b48f3c618ec76069731eb09d16515cf20b412429cd80a851f92e26
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to various domains, many of which are identified as part of a link farm hosted on disposable or compromised infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these redirected links. No scripts were extracted, and the document body was unreadable, but the heuristic findings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://mynigaoe.com/upload/file/20210721102424.pdf In PDF document text
    • http://quincy.pl/ckfinder/userfiles/files/zukejed.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/37205325843.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/riwitibusafarejiz.pdfIn PDF document text
    • https://nepalimodelagency.com/userfiles/file/59964904036.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/kipumumojepofaxesewo.pdfIn PDF document text
    • https://angkagenap.com/contents/files/nusafumidudijorugepe.pdfIn PDF document text
    • https://nhahangbienhaitien.com/uploads/files/vomurizegavatexojezukakop.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609de4a1d9b54---26087189705.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/04ujlgcor6rff6hm6vfu52oom7/pubikirudef.pdfIn PDF document text
    • http://hotelniagararimini.eu/userfiles/files/wajexeladawisutirawapefan.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/73050534257.pdfIn PDF document text
    • https://papersacksfactory.ae/images/bulk_images/files/57545779933.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/julub.pdfIn PDF document text
    • https://xn--mgbaf4adbs1bd2i.net/upload/ckfinder/files/nebepewuxusedazutokova.pdfIn PDF document text
    • http://kleinschadenexperte.com/userfiles/file/69057377194.pdfIn PDF document text
    • http://jongauger.com/userfiles/file/zuxezefapixipexe.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/4d498e91367ba0fbcf830090c5404b93/webev.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5d043c726b---75999481762.pdfIn PDF document text
    • http://es-manzokudou.com/yamituki-n/uploads/files/40177091434.pdfIn PDF document text
    • http://cleanyachts.it/writable/public/userfiles/file/20120136586.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608685bf75a53---14190719660.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1607f983f4d92c---36306375642.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=ichimoku+cloud+trading+pdfPDF 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_off0000e8e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F8 17616 bytes
SHA-256: b5783eebf8581549989bb103aaf81475add3c5874634101c5ec17c0d24016141
font_02_sfnt_off00012e2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E2F 10908 bytes
SHA-256: 5fd0509e1de0b57e6a6ae702e3d8af5852f43d3ea3cd4ade5c7f3cc5dfa22519

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