Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1096353e6ea9fa1…

MALICIOUS

PDF

77.8 KB Created: 2021-09-06 20:45:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5eed42240d3fa31ffd5ba651e677c82f SHA-1: 781574503bbefc5aa83579ed0dafd142cf3cfbc6 SHA-256: f1096353e6ea9fa110e4d6d6eb17cd8209aeae1846f35fe376cb2fb82a295210
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or trojan distribution attempt. The document contains a link farm pointing to multiple compromised WordPress sites and disposable hosting domains, designed to trick users into downloading further malicious content. The presence of numerous external URIs and link farms suggests an attempt to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://ledseoul.com/userData/board/file/dezegimivedarefale.pdf In PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160886270835d5---busuganofokinufibugapagi.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d4e2f00f7---29015333813.pdfIn PDF document text
    • http://telecycling.org/files/file/56614831877.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c953fa60fe---sedasafitunuboselepoda.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1c1d4e0ff7---37237014851.pdfIn PDF document text
    • http://plymouth-logs.co.uk/ckfinder/userfiles/files/20162072759.pdfIn PDF document text
    • https://gangnampools.com/contents//files/feforasipaxifugupu.pdfIn PDF document text
    • https://rajatotogroup4.com/contents//files/13155960712.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/padutororatulilumud.pdfIn PDF document text
    • http://haustechnik-hagenauer.at/73182852058.pdfIn PDF document text
    • https://ofly.om-digitalsolutions.cn/upload/files/7533144723.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f53b3cf42---vaduzaki.pdfIn PDF document text
    • https://tahitotfaluovodak.hu/ckfinder/userfiles/files/subiwobenu.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16076e3af294f9---85123521057.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/0b99060158e25d8f62073b02d920c23c/filefilijav.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e805357c41---forirufetid.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160760a422f0b0---82987927326.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adfc046e22a---56114761161.pdfIn PDF document text
    • http://chamdure.com/DATA/files/nabozarawevububoxawojar.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160bc62d59d814---5573910921.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-7-20/20210720211755452130.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=opry+mills+mall+map+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_off0000c8ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE106 10344 bytes
SHA-256: 9b77ee9d6ff1c7665c6c31ac93ef3245202cce53ac8833f7fc5fb334ffa7673e
font_02_sfnt_off0000f861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF861 18944 bytes
SHA-256: 0b90d64f9e804b50e347f36e9fa7f16b318186085f671b65f0b945d2461125f3

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