Malicious PDF — malware analysis report

Static analysis result for SHA-256 f570c8917f32388e…

MALICIOUS

PDF

87.1 KB Created: 2021-06-30 07:25:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 488bf1bf38b33c86ab677451cd3fd0b7 SHA-1: 6a9ffd80f19ad69742acbdbc94e91462305b8323 SHA-256: f570c8917f32388e61248357f6e70bf87452bc6404380f2b5656b4f0ba2e53e5
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of malicious activity, likely leading to a second-stage download or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160c6c2c3cfed8---61152600205.pdf
    • https://alatheir.com/atheirwsfiles/file/53557077627.pdf
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/3bf8ff412d9efa3be4864d3c5f49403b/76708499844.pdf
    • http://wearebryants.com/clients/3/3b/3bb22ab34fb8fe691aabc4d0498f9caa/File/zetuxa.pdf
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/mv5dirv105866nml3etdkveoea/60679073904.pdf
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/cee6a08d503b6c2440c53388b176a3eb/wawilozexogodusemasotiw.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ac02908d364---56147141989.pdf
    • https://llibreriaha.com/img/events/file/xiboxijulusidujugop.pdf
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/qsi1hogsr0ujaj2rfrvdo0dg7j/27514804972.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160763941e9195---kivogime.pdf
    • http://atomiccm.com/userfiles/files/64652163114.pdf
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/34b640be15402abfcb14fc7310580a90/15808851903.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/o66kms2q4rrgbdbftfll1a4dq4/98000841756.pdf
    • http://gorisum.net/fckeditor/upload_file/file/16479937392.pdf
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9fa8de47a---15379983568.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160a782d4ceb58---50178310048.pdf
    • http://cartopack.com/Images/file/19438826476.pdf
    • http://rockhousemethod.com/ckfinder/userfiles/files/rirajotevaporelepa.pdf
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160877ff4c7a89---zagesu.pdf
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/smtmt91h8cjtpae35qnfbqvsig/39714268741.pdf
    • http://jjmcp.jp/userfiles/Image/file/28070557124.pdf
    • http://hzbmsj.net/images/upload/File/13013577062.pdf
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/c70ebd5503e505a56dcdd56ed0fbffd4/87667945813.pdf
    • http://vienkiemis.lt/app/webroot/uploads/userfiles/files/xejibibebubonatafo.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/g2orq6dtvrbuemn84rlhsejl83/41034967285.pdf
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/81sk552s84l9m9it8pud1l11o2/bisukoniragusepit.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=draught+in+tamil
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0b5.bin
e5674dfde3809dacee7a204dd2d56280ea0ae9c8c103c47eeedbf358dd22282e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B5 10236 bytes
font_01_sfnt_off0001075e.bin
1d054932823f656904fc9db3844e75630eab215509ca32a813cecf2309dc5e05		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1075E 18760 bytes
font_02_sfnt_off000136ee.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x136EE 16792 bytes

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