Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb9b0d51740592fc…

MALICIOUS

PDF

70.2 KB Created: 2021-10-01 11:14:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 38d404e7a7e11b9fd1ab9529ca49b70a SHA-1: 1d27813a3e1f1b0febec52436f04b6bfcc67f1b8 SHA-256: cb9b0d51740592fcefe211cf27a0b94a6be2f15b6b630a8fdec6cdc4746d2064
96 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous URLs, many of which are hosted on compromised CMS platforms or disposable domains. The ML classifier strongly indicates maliciousness, and the heuristic firings suggest the document is designed to direct users to potentially harmful external sites. No scripts were extracted, but the structure and URL analysis point to a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://geomanteia.com/userfiles/files/kemifozuwetuxavasogivig.pdf In PDF document text
    • http://longarmquiltingacadamy.com/fckeditor/userfiles/file/52002713965.pdfIn PDF document text
    • http://www.veslovani-vsb.cz/soubory/file/difunaloletojelutegilo.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/161350760c0cc4---toxosudusewuvototimu.pdfIn PDF document text
    • http://didula.com/img/file/zobegufoteti.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/9b5dda4910772ea0d597abc90a37b28c/44142170137.pdfIn PDF document text
    • https://mecaniquekd.ca/upload/file/45572486757.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/63592864666.pdfIn PDF document text
    • https://www.tamilsaga.com/ckfinder/userfiles/files/33812649087.pdfIn PDF document text
    • http://giadinhmedia.com/uploads/files/32564927145.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/buzasogelezuredogekizitub.pdfIn PDF document text
    • http://fencefactoryny.com/userfiles/file/10640217965.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d76db8f5cf---foxarij.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/71792713876.pdfIn PDF document text
    • https://fobh.net/userfiles/files/74771567263.pdfIn PDF document text
    • https://sanipro.ma/app/webroot/uploaderfiles/6549802913.pdfIn PDF document text
    • https://cape-electronics.com/media/file/melusujefewazowinebu.pdfIn PDF document text
    • http://uceng.net/_UploadFile/Images/file/64556787744.pdfIn PDF document text
    • http://life-worldwide.org/assets/uploads/files/bizakedofelasux.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/81bfc22ba8149b2e7444fb79fa0f61e0/lutujilewerokopiwutu.pdfIn PDF document text
    • http://motivationandmomentum.net/ci/userfiles/files/81081768788.pdfIn PDF document text
    • http://tuanlongland.com/upload/files/pavekapewine.pdfIn PDF document text
    • https://commonlawhouse.in/userfiles/file/29216377733.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146df217d2b1---92957458209.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=registered+dak+trackingPDF 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_off0000b306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB306 15668 bytes
SHA-256: b8b29d7d728167ec46e064403384bfae1732d4d96232a740aceb2f846cc12658
font_01_sfnt_off0000daf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f30f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30F 10516 bytes
SHA-256: 743adf8299183ecf6b2a17aab267bdb17b4e991a7494298d9db144b6b933ecc3