Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcaeb8171258829c…

MALICIOUS

PDF

72.8 KB Created: 2021-09-17 08:54:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2e844242be89eae94ab74431ca303256 SHA-1: 9b17d8f68e015d643ab42ce9ae5e8de0d7408a11 SHA-256: fcaeb8171258829ca48c9c213cb3495a2f57d309171d7a0269446da6ab3909d5
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to obscure the final destination. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this is a phishing or malware distribution lure. ClamAV detection further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://www.kyousei-fukushi.or.jp/system/ckfinder/userfiles/files/moxumimopirigoluvuvuvuje.pdf In PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/xezotidoleragor.pdfIn PDF document text
    • http://novafish.it/userfiles/files/leriwunomo.pdfIn PDF document text
    • https://kurashi-kyoiku.com/cms/dat/upimg/file/gazomazewaxexax.pdfIn PDF document text
    • https://taumed.kz/upload/2021/09files/210909170957432714glhod.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/161409e08f3fe8---kebojinepejedukore.pdfIn PDF document text
    • http://buren-kompanie.de/userfiles/files/zojapajafutazalavibebifal.pdfIn PDF document text
    • https://0922.sproname.com/files/userfiles/files/50007156540.pdfIn PDF document text
    • http://abwfinlay.com/uploads/files/89119226673.pdfIn PDF document text
    • http://worldcar.jp/userfiles/files/kufosutak.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/26795722864.pdfIn PDF document text
    • http://volkshilfe-ktn.at/images/content/files/69306108826.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/99807838915.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/waxumesegof.pdfIn PDF document text
    • https://12shio3.com/contents/files/rozabejuzano.pdfIn PDF document text
    • https://peiitw.com/Upload/ckeditor/files/rugabewitarepikesuzilus.pdfIn PDF document text
    • https://chambres-lannion.fr/userfiles/file/3029157475.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/46876867303.pdfIn PDF document text
    • https://verandapattaya.com/userfiles/files/libonideselesilulajovoxi.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16140abab777c7---lenamudokivu.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/29588273457.pdfIn PDF document text
    • https://tylbm.com/Upload/ckeditor/files/bazabuzo.pdfIn PDF document text
    • http://www.guus.edu.mn/ckfinder/userfiles/files/16244876577.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/umpouhqh6c8bqi484isevqs7ie/54659094917.pdfIn PDF document text
    • http://frezerovka.by/images/fxeditor/file/fazeburifalawefakegated.pdfIn PDF document text
    • https://holcom-solar.com/webroot/img/files/geturofupirapotaj.pdfIn PDF document text
    • http://hb1004.com/userData/board/file/mebavufoxoxonuxepabiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=calculo+libro+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_off0000bb63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB63 16492 bytes
SHA-256: d36ac56ba13065155cad8f516925fe4bb0332f1e56a0cbee31844448f7c363a6
font_01_sfnt_off0000e46c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE46C 10384 bytes
SHA-256: cf07bb2d71e2180441f33653d3c690363d661f3de4eb428d340de58298c8549e
font_02_sfnt_off0000fbc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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