Malicious PDF — malware analysis report

Static analysis result for SHA-256 eab496a18e32b7e8…

MALICIOUS

PDF

80.4 KB Created: 2021-09-19 07:09:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b3ccd3205891052257b32d2b384d020d SHA-1: 0f7b4045f26646cd07f53c6b5e280d8289ef71b3 SHA-256: eab496a18e32b7e8133d85339d089312dd20089915e48374fcd443580c5a99a1
204 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting an attempt to distribute malware. The presence of a 'download button' heuristic and ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicates a malicious intent to trick users into downloading a payload. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with common phishing and malware distribution techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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 https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/1fe7ffc817058078127a0b81daa101fd/67692303856.pdf In PDF document text
    • https://bbox.ru/images/shared/file/33981831522.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb0e0d1ed2---deneb.pdfIn PDF document text
    • https://millersexpress.com/userfiles/file/rorugawuzakaje.pdfIn PDF document text
    • http://phrabat.net/UserFiles/File/79955405114.pdfIn PDF document text
    • http://turningpointdigital.com/cote_dor_import/admin/ckfinder/userfiles/files/6768926624.pdfIn PDF document text
    • http://www.texaco.bargiel.com.pl/ckfinder/userfiles/files/pexipilurel.pdfIn PDF document text
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/77127281688.pdfIn PDF document text
    • http://etkindenetim.com/resimler/files/datifoxoledet.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/43815934149.pdfIn PDF document text
    • https://mygoaltv.org/ipp/images/uploads/files/28952622640.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161341c47e5eb7---15654818015.pdfIn PDF document text
    • https://austdoorcaocap.com/upload/files/25093290999.pdfIn PDF document text
    • https://cubic.is/userfiles/file/84103296234.pdfIn PDF document text
    • http://ahnil.com/userData/board/file/zosomomunozowuv.pdfIn PDF document text
    • http://besteva.com/upload/files/92461371252.pdfIn PDF document text
    • http://imi.vc/upload/files/xexirivixaluperovel.pdfIn PDF document text
    • https://irastuff.com/admin/ckfinder/uploads/files/xibimabulim.pdfIn PDF document text
    • http://drsrkbedcollege.com/ckeditor/ckfinder/userfiles/files/69203131353.pdfIn PDF document text
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/fufakavunubosesexa.pdfIn PDF document text
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021090915175080554.pdfIn PDF document text
    • http://newkontakt.ru/userfiles/images/file/vitetefoduxuwa.pdfIn PDF document text
    • http://hybsch.it/upload/file/39205348224.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=tokyo+ghoul+pdf+manga+downloadPDF 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_off0000d14f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD14F 19220 bytes
SHA-256: ed58107714fb0f4896b4506fdad458f2e0bf7b69f88e30976170cc652144bf5c
font_01_sfnt_off000103f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C0A 10708 bytes
SHA-256: 97fb03994ebc4aa54878379b186d2ba8d743f1ef841a55bd43db7d8e0c07f400

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