Malicious PDF — malware analysis report

Static analysis result for SHA-256 84555b7bcf57d7a5…

MALICIOUS

PDF

81.1 KB Created: 2021-09-23 09:06:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d975ebbe63d97e8098b5b9bef8e81ac0 SHA-1: 80e02fa5413aa63880a7bbff3298ee2c26fc58ac SHA-256: 84555b7bcf57d7a50d8a70c499e91ab53ab6d2a0e3b36bbe8cf68cac2338d4b6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs, many pointing to disposable or potentially compromised domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://lotusburbank.com/uploads/files/zigunadoz.pdf In PDF document text
    • http://vanillasky-ch.com/images/files/23575687864.pdfIn PDF document text
    • http://gzxmbx.com/uploadfile/file/2021091721365873499.pdfIn PDF document text
    • http://crimesla.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/golokexurejidilidi.pdfIn PDF document text
    • http://loaamtran.vn/files/usersfiles/files/29753084161.pdfIn PDF document text
    • http://dreamwith.gni.kr/ckupload/files/98628383221.pdfIn PDF document text
    • http://mishor-uvk.com/uploads/files/duxotedajefi.pdfIn PDF document text
    • https://fortworthdental.net/cmsCart/upload/file/35994689285.pdfIn PDF document text
    • http://hflchw.com/upload/file/25683586370.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/a28655bbde05e76e502167dfede1bb8b/53915989842.pdfIn PDF document text
    • https://gloriamus.org/Uploads/userfiles/files/46503209328.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143dce243605---zafuwukirumokisujedotaz.pdfIn PDF document text
    • https://pecintajp.com/contents/files/dojomefunusosevu.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161441213a11b3---jozurakedizerisuruwope.pdfIn PDF document text
    • https://magiccat.pro/ckfinder/userfiles/files/53011323889.pdfIn PDF document text
    • http://moscow-vernisage.com/files/files/12288705327.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/f23dtcr628n8dvc4k1dlpnnmi6/mekopimarifiliwuranowi.pdfIn PDF document text
    • http://hexindechem.com/upload/files/99345642911.pdfIn PDF document text
    • http://vinaaquachem.com/uploads/files/73162430134.pdfIn PDF document text
    • http://salwex.hu/file/56333991937.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/99314783315.pdfIn PDF document text
    • https://suadienlanhhanoi.net/upload/files/xotexoxusuzubo.pdfIn PDF document text
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/50994426476.pdfIn PDF document text
    • https://postelezmasivu-liberec.cz/ckfinder/userfiles/files/zizovenofibikit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=download+alight+motion+pro+apk+2.1+3PDF 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_off0000d6d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D8 17728 bytes
SHA-256: 8fc48b8f47183405a901836cc705336646a1610d00358e74722eb0c7fb8483d4
font_01_sfnt_off00010544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10544 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D5B 11128 bytes
SHA-256: e464cd09f73c755b527bc5f4151def99b251ee17ff71871a543d5bbe028b050b

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