Malicious PDF — malware analysis report

Static analysis result for SHA-256 db7bcae8f230e83e…

MALICIOUS

PDF

108.0 KB Created: 2021-07-05 20:04:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: bed401bde990b5a3290e4eda5edb2ad7 SHA-1: a9dd2b8da562187b24dd18d95c55b0d67c191969 SHA-256: db7bcae8f230e83ec9109e2079c7601ba6a8a13d0363427a688e20cc8fe3b8f2
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external resources, many of which point to compromised WordPress sites hosting PDF files. One high-severity heuristic indicates a PDF link to an algorithmically-generated URL, likely a downloader. The ClamAV detection and ML classifier strongly suggest malicious intent, consistent with a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1609146f815818---57836849066.pdf In PDF document text
    • http://solartgaleria.hu/images/file/25319904745.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d4ad98bea---10150878878.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/a8102dba12702260f6d9765dee29430c/girerafazasalox.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/84033101557.pdfIn PDF document text
    • https://www.ppmcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/cb247kf1ha2farrrl20gokvg3q/kojefan.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/e0d8f2473b6d6d9982457af6600c5df3/26316591716.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160919b9612324---66468718003.pdfIn PDF document text
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/47979355007.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/h3cu1m7s2sr0m6858biv58aja7/78334205626.pdfIn PDF document text
    • http://kangs78.com/clients/66216/File/75316166158.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/72fc9f6074c587ccb5daa1f4d916776e/56197833777.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/mifixojubujilevokovet.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6a690246ba---31697134548.pdfIn PDF document text
    • https://bearings.vn/images/ckeditor/files/javobokoketurumawurujotob.pdfIn PDF document text
    • http://thietbiotoviet.com/Images_upload/files/32402932436.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/7he6c0natpg6d0fc647vqihajj/59544116024.pdfIn PDF document text
    • http://universe-micro.com/upload/files/20210623_002754.pdfIn PDF document text
    • https://legouic-peinture.fr/userfiles/file/luver.pdfIn PDF document text
    • http://gintaras.cz/userfiles/file/jemokusolulof.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b0bc21a2436---91055983714.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160cda53470722---66307901147.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/acl94uj75qo5vik2g7oubpq662/21520929016.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=the+ailing+planet+the+green+movement%27s+role+questions+and+answersPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b6ea1f375---xokugubazod.pdfIn PDF document text
    • 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_off00014105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14105 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15917 17500 bytes
SHA-256: ca4b2bd60f70928175a3e27b2b46c8d416667abe02ffbdc6960dd415a623f0db
font_02_sfnt_off0001865a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1865A 11236 bytes
SHA-256: 7999f2611a3126a807822b00b0bf9ab2dbbdba30da90cf103f99bc7588405e26

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