Malicious PDF — malware analysis report

Static analysis result for SHA-256 4567e7d7d2d1b79f…

MALICIOUS

PDF

93.8 KB Created: 2021-08-18 17:10:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 95d355d1bec7667b0dc36ca606b2346c SHA-1: 7bcdc2ad8c09613d54df7ed6122be64ef55f7b71 SHA-256: 4567e7d7d2d1b79f588e6f79b872a16b4314225dec36a1ddeb62a8c59b9b1f9a
164 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by ClamAV and an ML classifier. Static analysis reveals it functions as a link farm, containing numerous URLs pointing to compromised WordPress uploads and disposable hosting. These links are likely intended to lure users into clicking and visiting potentially malicious sites, aligning with a phishing or credential harvesting attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070d75f33c66---32825834511.pdf In PDF document text
    • http://xn--j1aai7d.xn--p1ai/userfiles/file/fiweta.pdfIn PDF document text
    • http://newbusan.net/FileData/ckfinder/files/20210807_27E109004674F865.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/jvejiuel5cjoh4jn6k8t83g05f/19542186721.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/zapukiw.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/dogezibupojig.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/34242808145.pdfIn PDF document text
    • https://ka-base.no/images_content/file/dikamuxapejabudusoni.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/b88pic4besggca8786qfsc7uco/59269874851.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/239112a23b24bc26348718a24181579d/wuzeberavimunalat.pdfIn PDF document text
    • http://pilanatofishing.com/home/sandbox/domains/shelter.sandbox.tritek.hk/public_html/ckfinder/userfiles/files/88104114792.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b88bbebc218---bizobezovewuxefa.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c0dc06aeb---29799030785.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160872aeb77400---lerinemewoposenokutuxiwo.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607d01eb135d9---zeribenodim.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/07832d15fb13d21979fc09c3db8532b8/3633966349.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4514b8f43a---zazewameluxudalod.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160987b2122809---68836855160.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/16920541755.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/nutuvo.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160857cd126aa9---59819009198.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/ee7b12427a5ca035d6f1d5a04f8cdaec/86216962997.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=quantitative+aptitude+pdf+for+ssc+cglPDF 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://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_off00010e6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E6D 17656 bytes
SHA-256: 57496871c3ba56a266d348ba25f6964e4299ec924bd32fcb90b0334a85a720c4
font_01_sfnt_off00013c94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000154ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154AB 11020 bytes
SHA-256: 77a6d08fa6acf000f711ab5a36a6ac146c0d25a096bbc5eee10edf28aeb1d5a6