Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef6fab8237ad5c15…

MALICIOUS

PDF

96.9 KB Created: 2021-07-27 23:03:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: afd6ebe781b754c34c61177ecda27d5a SHA-1: 437694d9594704929697a0323a0cdbd89b45fc4e SHA-256: ef6fab8237ad5c15729f3f279314b0ee42fa9af8b07c494d6910d48eac055c7e
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan PDF. It functions as a link farm, directing users to numerous external URLs, several of which are hosted on compromised WordPress sites. The presence of multiple links on potentially disposable hosting and the use of UTM parameters suggest an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://cokhiminhhien.com/media/ftp/file/74532576232.pdf In PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/7fbda581038edc91655c4366ab504e5f/pituvepalurupiwavadul.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/ad68e6c0c77976907dcfa3a9e95df1d3/kutiseler.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16083de8e37cfb---vidixibe.pdfIn PDF document text
    • http://diamondsnspurs.com/clients/12200/File/jiwusadekejedovimuf.pdfIn PDF document text
    • http://tamlaproject.com/userData/board/file/wesapunu.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/jinavebevewigedaxupelanul.pdfIn PDF document text
    • http://americanewbie.com/userfiles/file/67628191312.pdfIn PDF document text
    • https://upbfassadenbau.com/upload/file/51491179899.pdfIn PDF document text
    • http://riph.pl/userfiles/file/8597680412.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9fb21d9f9e---nobupivoz.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/7ve5ndgdf5ons95dnnl0qnh512/vizowixuvudapijozije.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/h8gh806drqvasvu99mcskn3icg/46728800194.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b2b3e36753e---dezijamiba.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/d140aec45065e21a496a0cc5b11e6063/jasozofob.pdfIn PDF document text
    • https://cartolmania.it/file/83410219364.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609844f2069ee---lovelemo.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/45777543954.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087838964265---94543410499.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/35137497073.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/14765122534.pdfIn PDF document text
    • https://bmw-zona.ru/uploads/file/72451521083.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=sample+cv+for+internship+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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011486.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11486 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012c9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C9D 11024 bytes
SHA-256: a2c25f0e2707ca0a37775d6303299c24273c78c25eec17a3fccfea7e00cf3628
font_02_sfnt_off000145ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145FF 18384 bytes
SHA-256: 3953286108a7deccae7a6b308f71096b57d88c2ea3bae913d50fe09b9eef61e4

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