Malicious PDF — malware analysis report

Static analysis result for SHA-256 1704813bb943a639…

MALICIOUS

PDF

91.9 KB Created: 2021-09-05 16:52:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7eac2aa6835c938500aca9f05232160f SHA-1: 3f1e738f69602050f8b07e229289932d2ff3f72b SHA-256: 1704813bb943a6394850f2f5674616afab0385d0ba6b23399ac95e7113d57fb4
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports the lure-based attack pattern. While no scripts were explicitly extracted, the nature of the links and the overall detection suggest it's likely a downloader or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://studiofagiani.eu/userfiles/files/89627565760.pdf In PDF document text
    • http://suncitygroup.ir/basefile/suncitygroupir/files/30461265610.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082561e13e87---26372547363.pdfIn PDF document text
    • https://porterbrothersltd.com/app/webroot/uploads/damumewokelezi.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16093a6ba0ad03---37478242338.pdfIn PDF document text
    • http://jmk.kr/ckfinder/userfiles/files/vijis.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/d09f1e2f2a89f209e286e62579cc411e/15931358585.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/20694130494.pdfIn PDF document text
    • https://pacie.vn/web/uploads/files/berelafubakaxeladunixika.pdfIn PDF document text
    • http://sns.hu/_user/file/dotadagodonujitugat.pdfIn PDF document text
    • http://co-mit.com/uploads/files/zukaviwi.pdfIn PDF document text
    • https://henklinders.nl/henklinders/upload/files/kelekegejikewavik.pdfIn PDF document text
    • http://kdbelektrotechniek.nl/uploads/file/lilesifomobiposavuluti.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfafaa5a16e---66594755140.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c114e7e7a---fudivuninufezejaw.pdfIn PDF document text
    • http://keralastatetailorsassociation.com/userfiles/file/wufigojanikopuwutoze.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a5fdd01dfb1---fuvewapevima.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8e8abddca---19299346401.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1db25a48f---31471803381.pdfIn PDF document text
    • http://nprofit.hk/userfiles/47411692341.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/dafodejikojolurewav.pdfIn PDF document text
    • https://murten-hotel.ch/userfiles/files/lifisate.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=rrb+group+d+result+2019+guwahati+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_off0000fd50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD50 18912 bytes
SHA-256: c2ce3901f9603aff4eb2fe6bef94d74b2920a152462a3e8d2e19d87cc70f7d7f
font_01_sfnt_off00012e5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E5D 11504 bytes
SHA-256: a60f4044111cd6c9745bffa28e4c8a839feac325d71bd8e7ee7dc937b268c7b2
font_02_sfnt_off0001496f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1496F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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