Malicious PDF — malware analysis report

Static analysis result for SHA-256 906047094e57dd1a…

MALICIOUS

PDF

79.2 KB Created: 2021-09-12 07:29:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b674b66e2418ef3230726f0f1dfa38d2 SHA-1: c666d1a5858e57852b297768fdf9361349b3aee6 SHA-256: 906047094e57dd1a16c3522c353fa23785daedeec9fcaff45e02e5ca54d82f2d
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a PDF link farm, with multiple URLs pointing to potentially compromised or disposable hosting. The presence of external URIs and link farm characteristics suggests the document is designed to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 http://leaguengn.com/userfiles/file///56267617508.pdf In PDF document text
    • http://www.greddy.com/admin/common/ckfinder/userfiles/File/xobevaxareganewugoduxemeg.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/10175574296.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16133a8ffef112---savote.pdfIn PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/nejowutexo.pdfIn PDF document text
    • http://patrickstaxi.fr/userfiles/file/54522839127.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7ad35cfad---nemojijuguxudalade.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/kufidibajukiruto.pdfIn PDF document text
    • https://nationalshield-uae.com/userfiles/files/salisubut.pdfIn PDF document text
    • https://t2sc.me/userfiles/50672056108.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/nitupevanekewoxomimanif.pdfIn PDF document text
    • http://lustigersteirer.at/userfiles/file/gerosegekelid.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/16136653839813---3647990251.pdfIn PDF document text
    • https://markiza-trade.ru/admin/ckfinder/userfiles/files/pemukovupefaxutukitazuj.pdfIn PDF document text
    • http://hicoweld.com/shop/fck_file/file/xuduwuk.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613118511a482---vuwijuzo.pdfIn PDF document text
    • https://tonerihned.cz/userfiles/file/27780046380.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/21217086513.pdfIn PDF document text
    • https://pracowniatechart.pl/fckpliki/file/6068229595.pdfIn PDF document text
    • http://liga-stf.ru/i/upload/files/duxawibutolomef.pdfIn PDF document text
    • https://rwd1.thadv.com/upload/files/baviwofomuputetabu.pdfIn PDF document text
    • http://motivationandmomentum.net/ci/userfiles/files/noruziver.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/01921c70803edc0b9e67a6cb318f5cf1/koxavewakovumijowo.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130f7039e868---64530740954.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/fujowokadinizadejuli.pdfIn PDF document text
    • http://parcroyale.hk/userfiles/ketaf.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-9-6/20210906155444781464.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=punishing+gray+raven+jp+apkPDF 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_off0000cfa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e7bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BB 10768 bytes
SHA-256: fd2bb118af9bb940aef6fbf31e2e6a12c02aa921d220f5a518e9bad148f6da69
font_02_sfnt_off0001006d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1006D 18004 bytes
SHA-256: cb261f0d5faa07ee479fd52f663e90be2a6841dc1d4d01063e97cee4c3156dbf

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