Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc0f4f104d2fced8…

MALICIOUS

PDF

132.9 KB Created: 2021-07-19 21:42:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: a84653f64e37eadfa4863839bb123b0c SHA-1: 30b1cba7455b9b061874fb6a2a421136e02ce011 SHA-256: dc0f4f104d2fced8182cf8fc332d530556a99474e7b2f5faad0ad5e427fb40a3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9851

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://iqlacpro.vn/emotive/upload/files/29881222648.pdf In PDF document text
    • http://extracam.es/app/webroot/arxius/file/lefofejog.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d073b33bfe8---5465501134.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073eca14043f---74246887720.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a648fc6ed8f---vokaxasu.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/79394171748.pdfIn PDF document text
    • https://voyageaventurenepal.com/upload/files/14329563250.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/63024c173ff424655f2c25f4ebc63d7a/rosokexubomexe.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091fb6fc06b2---tumilidejoburotijogapelu.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/37139660621.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/xizugemomitujiwisidoke.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/bqd0lalq2ij1t1r5c6q03vo42b/mumogaluvemivuja.pdfIn PDF document text
    • http://oroblupiscine.it/userfiles/files/zapugugujesoguvefanijozax.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/16fbea5afef9018c8b43254e309c98f8/8752785535.pdfIn PDF document text
    • http://fairview66.org/clients/866114/File/48354167167.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/kidixukupegaven.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16085dc846d24d---33066032126.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/bbb7e262a580d261d0bb7399e7277ac2/11878469705.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/d5ef25a75595699d9e53e9800879d7e9/21008417013.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/56rshapas9sb0mkqba75dvhci7/kapufubadusetisud.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/nugirulivozabosunez.pdfIn PDF document text
    • http://bhs-class1957.com/clients/35434/File/tasituti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=notion+and+gtdPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f29c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29C 17752 bytes
SHA-256: b58edeea051fdc610791ba261f2d4af77d6aa315ae12c2536babbc147e663d0e
font_01_sfnt_off0001212c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1212C 72592 bytes
SHA-256: 825a7c1c57f1f0e8fc45a7a91af5f56a14bfdd30a22919dba80ab71e877d13bb
font_02_sfnt_off0001d86f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D86F 9956 bytes
SHA-256: 7c99737253dc778860e6427acfd0e54f02621274497d0cca93a410dfc55fa179
font_03_sfnt_off0001ee54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EE54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1