Malicious PDF — malware analysis report

Static analysis result for SHA-256 adf9a67b2541b048…

MALICIOUS

PDF

73.2 KB Created: 2021-09-07 21:44:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f50e430288aea6f4ccb52ffc9dd05948 SHA-1: d5c61488fe3a7d5450825bd0744e548c257923ab SHA-256: adf9a67b2541b048bd8bba9cfd82fa8cdd5aa87aede7e06b5509bf4aabb5de27
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with many URLs pointing to potentially compromised websites or disposable hosting. The presence of numerous unknown URLs suggests an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://windsbs.biz/files/file/76416890710.pdf In PDF document text
    • http://atmaircenter.com/lb/userfiles/files/somajobakizireligesafar.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160ba999ada4c9---57739169770.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/c5ab314f917eacb3a93de56d1a37943e/43064621849.pdfIn PDF document text
    • http://tbvshungviet.com/upload/files/watuziko.pdfIn PDF document text
    • https://mmszke.hu/files/file/mukenibavibuzokufi.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/sudovigowew.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/b8775705ebdd49bfd78e84f50142bffa/33238343831.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/vagorejosox.pdfIn PDF document text
    • http://elpijisystem.com/file/39837768195.pdfIn PDF document text
    • http://tysons-cafe.com/uploads/files/30929245016.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aabb6a71dd9---nuvatumasidegunumejulamo.pdfIn PDF document text
    • https://www.emcp-pmce.ca/_includes/ckfinder/userfiles/files/mofidudu.pdfIn PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/48822588797.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/cf95e9c3cc194d1bb58d195beb8633c6/46852312232.pdfIn PDF document text
    • http://thebankcardservices.com/uploads/files/digozub.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210503195239164.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f1326c591---62026126124.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/7132133489.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/5cad3a298325840268789812dc35b6a3/46388568881.pdfIn PDF document text
    • http://xindeshiye.com/uploadfile/file///2021081123554850.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/5bdc040aesbtdv1afg3v5avojb/nowol.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/88174291595.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=goniometro+universale+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_off0000bae2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d2f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F9 10864 bytes
SHA-256: a3d79ea6284f1ddfbdf1bffcc4dfb477149fe9ed50981a0f07d475615c5e8192
font_02_sfnt_off0000ec1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1F 17076 bytes
SHA-256: 01331306954ff9a629f3f92d6ada42f4b9a08a07fa0f946609b66a4210515ff4

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