Malicious PDF — malware analysis report

Static analysis result for SHA-256 41279181e34b8e47…

MALICIOUS

PDF

77.5 KB Created: 2021-07-18 01:34:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5bad83461bbf21b4e486312c13525ab0 SHA-1: 3906a13a86341fc9e3072f0cfbad970b66a146b8 SHA-256: 41279181e34b8e47d4e113c82b6490b950060a7ec51b717554055b6a7f02016f
104 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, many of which point to compromised WordPress sites and disposable hosting, indicating a link farm designed to manipulate search engine results or redirect users to malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9829

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/6n8ibth34misnmu6cllairatg0/xefuwimejaduxujomixadeg.pdf In PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c88e0476451---87443823178.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e9d282e7d---pejewinegope.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/3fab9d2562b2d7ca455ac5be003418bb/jivibukiratexaxipaz.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16070095f4da90---54992600701.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/wixobozunexuvemusivurer.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607168335e6ca---xemobujep.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083bfab29554---57079831303.pdfIn PDF document text
    • https://newchat.xyz/js/ckfinder/userfiles/files/12987579572.pdfIn PDF document text
    • http://vizit-k.net/uploads/editor/files/ligidenofinimu.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/rapufodofamidamovewereka.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd7d88f5bf---kidusof.pdfIn PDF document text
    • https://p99.tw/pro_pic/files/zunigujosuwebuv.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bdf900b87c7---4508644712.pdfIn PDF document text
    • http://5m-tti.com/uploads/image/files/tagepisebemoso.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f2bbdf33a---nawutininexuvidowijodavig.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/cnikrhd4l8ua2rcsb16ug9o0oh/gekof.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e5e125ac9d---zejotubu.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160c9989fe5374---xoximazujevelemaz.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b5219fc5f7e---majutofazapizaleve.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb92732e01---37879489170.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b417167c6df---38516261748.pdfIn PDF document text
    • http://sshs1962.info/clients/3/33/33dcd814b32da85629335a95ab3d0158/File/37524009724.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160abef46e49e2---45219336730.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099b0f21d825---tutopokinanikasenape.pdfIn PDF document text
    • http://drive4smilesontario.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/78182427974.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=contention+meaning+in+bengaliPDF 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_off0000caa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e2b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B4 17592 bytes
SHA-256: f90ee5fe936fb06f4ccf5c41eba9b4700a3529c6cdb1b4466b37db2b79403fdc
font_02_sfnt_off0001112d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1112D 10352 bytes
SHA-256: c3561b10fba3c7e541f19daf8c6dfb4814ecfc599014059eadffd243b6e1e051

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