Malicious PDF — malware analysis report

Static analysis result for SHA-256 615829877e9377bf…

MALICIOUS

PDF

87.5 KB Created: 2021-06-27 04:10:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 2cd40a9d29814452a2f4d07aef04c574 SHA-1: 6c36867c2760469a79392c8f97cbc4d756794b1e SHA-256: 615829877e9377bfb5e00f64e620aec8e6f9511f355890e99ea121d7d4cc8648
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The presence of multiple distinct hosts and the use of UTM parameters suggest an attempt to obscure the final destination and potentially engage in SEO poisoning or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • 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.
  • 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://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/c0c0119e24f4d6aba0c9fbf998bf3bde/259428008.pdf In PDF document text
    • http://boilerservis.ru/uploads/files/32143506443.pdfIn PDF document text
    • http://purifoy2020.com/clients/1/11/118d8b7ee1ea4bab8fb19da95c56260f/File/vugifuduj.pdfIn PDF document text
    • https://nhakhoaanphuoc.vn/uploads/files/zosorejusofiresesaned.pdfIn PDF document text
    • http://tscyw.net/userfiles/file/20210626012639_p4mfvb.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607a78fbe9a5b---50698837236.pdfIn PDF document text
    • http://j-club.eu/userfiles/file/punodedumelufu.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c761016cb1---49777692660.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/3d5a799428c433824f1e5bb598a4bc41/6348544981.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/wilalil.pdfIn PDF document text
    • http://cf-solutions.org/app/webroot/fckeditor/editor/filemanager/connectors/php/imgmedia/96906000506.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b71608c44da---patemewewobasoxavikuri.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/ddc2d81458db5cfcfd70ade5cc3fdbb2/88753205693.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/87902854672.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098cc093a8b1---nogatewesaporewofunipaf.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5de1e7b736---10134781335.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160857a186a8d4---robitevigidabiv.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/5485b767a1f8c24bb90019d9787b3e42/15990320694.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607797d66c024---babuzovalorotowapatifo.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd88d3882e5---53302765604.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/5858496577.pdfIn PDF document text
    • http://gt-outillages.fr/ressource/site-image/files/91650425397.pdfIn PDF document text
    • http://kokocurry.gm/userfiles/file/27795031131.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=brock+microbiology+15th+edition+pdfPDF 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_off0000efca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCA 11324 bytes
SHA-256: ca3e710a65217cf0d2bb941700f704b0340aeadeaac24b05c9048db836042792
font_01_sfnt_off000109e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E7 17144 bytes
SHA-256: e5a1f59a32b9be170fb2870028ecf74c9c7d31c25b1569ed75a964708457fde2
font_02_sfnt_off00013721.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13721 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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