Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c08abe23c41dd17…

MALICIOUS

PDF

84.8 KB Created: 2021-07-04 17:21:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: c533466b98ec8550b46bdd50929f89c8 SHA-1: bf6b6d966492e9780937c757ccde1aaba001c070 SHA-256: 7c08abe23c41dd172389176b8e8c3d43ffedfbe962f54ca10182147bef5f743b
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links pointing to various websites, many of which are hosted on compromised CMS upload directories or disposable domains. This structure suggests the document is intended to act as a link farm, potentially for SEO manipulation or to distribute further malicious content. The ML classifier strongly indicated maliciousness, supporting this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • 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://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/625393e17b824e5cc5893e2e7bab7efb/xapijigemap.pdf In PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/6c7714cb14bb8225bbb782a38cc3e20c/reniroluwekun.pdfIn PDF document text
    • http://atreve.eu/ubezpiecz/obrazy/file/sinolurunezitafubu.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/11315d1408b6a011f23f177c9c036f5f/30036871235.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160830e494c221---gawalaveto.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/aad7233b433666df4f87052d01642a93/53585119686.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/1b2a168eaa3c31ca5d81c8768bca1c62/63136686760.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/d2cd7de6fdb9ef08de003226d82c2f5f/72681786110.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/fe2da3113e426ab992182718a5e83939/wutomifuxi.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/e7733d298a02797797e5efff4bbbe3eb/jugofer.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/162428812177730981956.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/24f4f12d0c51fc24e98605751d141e60/66650598802.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608838831c32c---mufadup.pdfIn PDF document text
    • https://polandpools.com/contents//files/biwavodefukijuj.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c53267a63---serakukigilewewufulijo.pdfIn PDF document text
    • http://canevinclassof70.com/clients/6/6b/6b8b8ee0d314e59372afbcb75100d768/File/41534997440.pdfIn PDF document text
    • http://cloverpark1959.com/clients/51168/File/26183178819.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/1c6cf5c772f4c1ed4afc20689897e8b6/34647210553.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/27201446869.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16079caded792b---xudilivifuzebopepiguxaxo.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608baa9a3d0bd---86024768321.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e10cf07e88---wukolavesapekumifigulun.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/moxesevumofufupo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=keeping+a+ferret+as+a+petPDF 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_off0000ea83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA83 10356 bytes
SHA-256: d9f91b3c4ead6106f05c47d30c63768659e1fd5f88ce0ad2a0c7b7ddaab14863
font_01_sfnt_off00010210.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10210 17012 bytes
SHA-256: a6871a86b8d06bdb3341b199d6dfc6ca56588a471913e1556864da458af59f98
font_02_sfnt_off00012e10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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