Malicious PDF — malware analysis report

Static analysis result for SHA-256 689f8050a877324e…

MALICIOUS

PDF

88.4 KB Created: 2021-08-14 05:57:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: e27796535d28574052b820953f65b5ad SHA-1: 6ff6bf174e75af8b73356d48313be1127a67ce74 SHA-256: 689f8050a877324e08b066e799c12c1d068967a9d0c2ed3bc73fe5ceccd53176
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, forming a link farm. The primary purpose appears to be redirecting users through these links, likely to a phishing page or to download a secondary payload.

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 http://montaze.org/democms/userfiles/file/2990141655.pdf In PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ed5d911de6---dekuwezavawi.pdfIn PDF document text
    • http://nhatnguyen.vn/media/ftp/file/77842639823.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16088bf877ea0f---wekubatopovatepu.pdfIn PDF document text
    • http://optikametuje.cz/userfiles/file/vidude.pdfIn PDF document text
    • https://rosenstein.lu/userfiles/files/juvemoseg.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a80213e59c0---59912762237.pdfIn PDF document text
    • https://ottopianos.nl/files/72293580563.pdfIn PDF document text
    • https://susta.vn/userfiles/file/27173404360.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/775f0326aa4136eef2faf739173842f5/63036875262.pdfIn PDF document text
    • http://ourhkg.com/UPFILE/userfiles/files/34576879320.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/78919374394.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/35959331114.pdfIn PDF document text
    • http://profil-metall.de/content/uploads/file/komegugiwep.pdfIn PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/lilojukemukadebarir.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/25784576372.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/vamesom.pdfIn PDF document text
    • http://acquadiqualita.it/ckfinder/userfiles/files/dizuvexofe.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/r3kqhsf7q93ilha9856m18f0d4/jekep.pdfIn PDF document text
    • http://www.toptehnik.si/images/dalupexigavi.pdfIn PDF document text
    • https://maturana.cl/upload/file/66858326492.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/tcplr021pbijvnul1kdrina0lm/fixidonejoponifexako.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/741c42b345d3124004857566f5d83413/rifove.pdfIn PDF document text
    • http://vietxetai.com/wp-content/plugins/super-forms/uploads/php/files/jvmekoe0bismf9822seirhmee2/vinerujomuzilevuno.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=explicar+el+principio+de+edificacion+progresivaPDF 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_off0000f2ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010abf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ABF 17996 bytes
SHA-256: 4c5b75f32ea7ee7c044798fc26337f4ff68c5583a2076c5fb7787ca1a6e3a540
font_02_sfnt_off00013861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13861 10848 bytes
SHA-256: 37bbda8821229adeb404f88420b6f4e148b1d09298a093d326dd7fe904536f5e

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