Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c89056199bd57b9…

MALICIOUS

PDF

84.1 KB Created: 2021-08-16 12:47:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 105de7f39110b65b84dc79fb3b68d29e SHA-1: 2e056a5375ce00ae370f32bc4e621c3d1120c631 SHA-256: 8c89056199bd57b95987d2c74ab89e51f96f3b27fdb1ffde532894dc4c8e2161
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous external URLs, many of which are PDFs hosted on compromised WordPress sites or disposable domains. ClamAV and ML classifiers flagged this file as malicious, indicating a phishing or malware distribution attempt. The primary function appears to be redirecting users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://yellowstonewildlife.com/90826496545.pdf In PDF document text
    • http://web68s.com/upload/files/bugasuxofete.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/8b4954328b7f47c3a5a79d4bf6a26205/dajodijazilosa.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/nerikudowewosesojojabupol.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160719d8070cef---jatexebojubigas.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/d55d72500ddc34c5c2fafc30ed092a07/93357717333.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/kaselifazatelujetutimovev.pdfIn PDF document text
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/57180716003.pdfIn PDF document text
    • http://zlato-stribro-investice.com/upload/files/22791143042.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/11771be5a25515a110a7ea9f1267dbc6/wudujimolarekaperadova.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160947de28e519---10306580609.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d69ca46ac9c---8228716219.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/o3kbnkg7nh2qimc039me5i8e42/vamopijozaxatabifofexifuz.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/63738036930.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16094906cc8ed9---linenobowexamufelozotupi.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/e1o006gkfg3en9fmi78tm2mh5f/dagozuvivuw.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/62510482722.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/lugixalovatupujoweledisax.pdfIn PDF document text
    • https://heyratacademy.ir/file/52785416282.pdfIn PDF document text
    • http://www.humillacionyestrella.org/ckfinder/userfiles/files/jadinarepixibejisonibapi.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/wuwomilamisarakodoziz.pdfIn PDF document text
    • http://jorkurojus.com/userfiles/file/88988814270.pdfIn PDF document text
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/15005224950.pdfIn PDF document text
    • https://weboonline.com/ckfinder/userfiles/files/kekixukokolivusu.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/l6qcnd87qd9tvv6145pqcs5cnn/gejaxerifilij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=ejercicios+tiro+parabolico+1+bachilleratoPDF 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_off0000e0e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E7 10672 bytes
SHA-256: e61d98b8acff51498c1e45a27c6a4935356d023a8d1485d99238ca2fa1d68d2e
font_01_sfnt_off0000f942.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF942 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11154 18552 bytes
SHA-256: a28ba8c3690a1e4eb9798abdcebc51cf286117e04193095641bfd3b43c08eb8a