Malicious PDF — malware analysis report

Static analysis result for SHA-256 489c3080d4caceba…

MALICIOUS

PDF

81.1 KB Created: 2021-09-13 00:56:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5e35f9f5fa2beac749c8839ce52fd53e SHA-1: 3a6be42b4b17583bba07cae41be07c98e1f467d2 SHA-256: 489c3080d4caceba4deb00993bcf84e9fbd8a9f3d40773b239cfe29199bbb174
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or trojan payload delivery. The presence of multiple external URIs and link farms points towards an attempt to lure users to external resources, likely for credential harvesting or malware download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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 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://laborke.ru/uplcv?utm_term=gif+cake+happy+birthday PDF link annotation
    • https://ahl2005.com/ckfinder/userfiles/files/makebapabunufajanirif.pdfIn PDF document text
    • http://fotografiafrancescosomma.com/userfiles/files/woputegabunadogaxuvu.pdfIn PDF document text
    • https://ashasuchikala.com/ckfinder/userfiles/files/vubefunumineviranutupegur.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136fae45aae4---wuvuwusurilasari.pdfIn PDF document text
    • http://hyundai-dongdo.vn/images/files/jadafemu.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/kh1nivdatrt85hin6pa5r45oj0/bujimitewogojid.pdfIn PDF document text
    • http://bayernglobal.de/userVZ/file/85355408397.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/zulikalunominojeliwufima.pdfIn PDF document text
    • https://angkagenap.com/contents/files/25375101170.pdfIn PDF document text
    • https://larustt.com/upload/ckfinder/files/jirifisoxopema.pdfIn PDF document text
    • https://efsanepin.com/calisma2/files/uploads/nodamefawikutokumode.pdfIn PDF document text
    • https://yk-tech.com.tw/ckfinder/uploads/ckfiles/files/kevevifofepapulaxi.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/wowonuvidit.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/03807bb5aa7e1a83b3d25e5d81c8dcaa/65857214586.pdfIn PDF document text
    • http://st-communications.com/ckfinder/userfiles/files/kavafirezakomakuturujow.pdfIn PDF document text
    • https://bcm.es/files/galeria/files/nilamekozodukaregafuk.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/jizovalubugu.pdfIn PDF document text
    • http://viquadro.com/userfiles/files/xojexalepamevuseroburavam.pdfIn PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/2123634513.pdfIn PDF document text
    • http://www.shjkyq.com/up_files/FCK/file/90802531897.pdfIn PDF document text
    • https://sogelec-eng.com/files/ckfinder/files/riwaxonuwibonu.pdfIn PDF document text
    • https://bazab.ru/ckfinder/userfiles/files/kororivufarubamajukenabux.pdfIn PDF document text
    • http://pagyesa.org/userfiles/file/20210911013230.pdfIn PDF document text
    • 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_off0000db03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF315 17088 bytes
SHA-256: db0f541f7f126f52faf39f7bd926ded76134651529494cc54f8929a5ce80f628
font_02_sfnt_off00011efe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EFE 10664 bytes
SHA-256: f9034e1ffc8d991bbb1b25bab5fe6cfd8da138b728a36f28c68dfac739677a6c

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