Malicious PDF — malware analysis report

Static analysis result for SHA-256 519c45f3a9a53807…

MALICIOUS

PDF

82.9 KB Created: 2021-09-12 22:45:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 44e593ca4f7f25cb2b72597989570065 SHA-1: 0ba8988752c438e5c620d97d1726db9264a40fa8 SHA-256: 519c45f3a9a53807a5000cb90695f8b814e9101ce7fe8767aad33646e2ce0be3
156 Risk Score

Malware Insights

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

The PDF contains numerous links to disposable hosting sites, a common tactic for phishing or malware distribution. Heuristics indicate it's a link farm on compromised WordPress uploads and disposable hosting, with a high ML classifier score and ClamAV detection confirming maliciousness. The primary goal appears to be directing users to potentially malicious content via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ms02bet.com/contents/files/84961795485.pdf In PDF document text
    • http://cartopack.be/Images/file/81949971559.pdfIn PDF document text
    • https://oykufestivali.com/ckfinder/userfiles/files/99991600929.pdfIn PDF document text
    • https://abyway.lv/images/ck_images/files/gowusazademopobun.pdfIn PDF document text
    • http://lienming-rubber.com/uploads/files/202109082051104269.pdfIn PDF document text
    • https://tidymoney.com/ckfinder/userfiles/files/1971613483.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/fcb50775b23019a8dcad3bac401d6630/60346357778.pdfIn PDF document text
    • https://2acontractor.it/images/file/71822009407.pdfIn PDF document text
    • https://srldirect.com/ckfinder/userfiles/files/tarapuge.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/xevafaropesuxaza.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161348f89c261f---zanotabatategavose.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/pojefomurepevepukalav.pdfIn PDF document text
    • http://eg-connect.com/uploads/editorfiles/file///sidinajoxul.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134341088255---nepagajojipapoj.pdfIn PDF document text
    • https://rimi.sk/userfiles/file/29841486278.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/ce5f13e10e56bdb465c3fe733d6b78fe/35986792883.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/33564612655.pdfIn PDF document text
    • https://palezieux.com/ckfinder/userfiles/files/30672379647.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16136772e10788---gojugajorebuxifopel.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/16425295972.pdfIn PDF document text
    • http://tayles.com/uploaded/dijezinakafuvegebapevof.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613dff8324f98---28794412801.pdfIn PDF document text
    • https://umutisi.com/umut/upload/files/limadilinapaxiwi.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/4160884ba0509759a77806d0a03577c1/xifegajoduletajeri.pdfIn PDF document text
    • https://topupdana.com/contents/files/701745175.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=videos+de+fondo+de+pantalla+para+androidPDF 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_off0000dbd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E4 19424 bytes
SHA-256: 237b3e86c3002a9212dae45d038babac6e493c336b719f0cf6388680e6986723
font_02_sfnt_off000125ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125AC 10460 bytes
SHA-256: 6797a4481d9c11aeb600f8ccfe3c52f39467e174f35c109472b26a6500429f52

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