Malicious PDF — malware analysis report

Static analysis result for SHA-256 934f248cf07388b1…

MALICIOUS

PDF

85.9 KB Created: 2021-07-02 17:16:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ba56ee0e8207d1942c4fe9b5091d7a60 SHA-1: 12857ada04806290a2f859b1dcd92ae6a91f8e7b SHA-256: 934f248cf07388b15be5ee51da84e3d1016e248d12e2dbed9f6f0fd4ab1d42b2
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple domains, many of which are hosted on compromised WordPress sites or disposable domains, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/c9f3dc872df205d1933e1a49f925281e/vipifibibonum.pdf In PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b1edb3a8605---sowafiti.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/426dbcc9c19a8eb6691055d6e5cd25c3/11302181932.pdfIn PDF document text
    • https://agermag.ro/mm/file/xowutijikopebobudonejasin.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/de3af96f162103b11d013fb46fdb1b6e/zutodadipinipafugutelemi.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/mujavusetunoliro.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b782c85d350---jikesobusane.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/531e9604a03882bba0dc2f69e217bed5/xusupa.pdfIn PDF document text
    • http://yilip.net/userData/board/file/fomuduberu.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16085087f9d9f7---wajupudezes.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160de7d8f37db2---43514485875.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/lisikulunafemalidabi.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/773e05be1ea054ecbc5951222dc15689/45565910036.pdfIn PDF document text
    • http://ildongwire.com/userfiles/file/bifilesawesosavexokebe.pdfIn PDF document text
    • https://www.rockfallco.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607112ebbe15b---bekav.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/19251767585.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/54272712371.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6accfa0ff4.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/16523737876.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9c3336e9a6---48775119771.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/56369brf9jpbf5s76lnhovvjc7/72127216287.pdfIn PDF document text
    • https://nbcmedia.vn/ckfinder/userfiles/files/nifawaroniluta.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077e4afdc846---novuviwivudaditiveleje.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9f70bf1ef---puzefagavowagitogowikava.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=avery+labels+template+18660PDF 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_off0000ecda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECDA 10948 bytes
SHA-256: a7eee1f9b1c703f57350d44605ee26c85c0759f9394ef9242f4b6d7764fa2616
font_01_sfnt_off00010636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10636 16500 bytes
SHA-256: a496be49f6d06cc46dd9208c45b995d5038891f9f1a5b63a49bad1205edc8d44
font_02_sfnt_off000130a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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