Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c997b8b3b83f24f…

MALICIOUS

PDF

83.1 KB Created: 2021-06-22 20:55:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: b9d9e1560fe8e03e5196aafadc429092 SHA-1: 43d8a203f9196356d439a4fbb1035d1e565f2452 SHA-256: 1c997b8b3b83f24f957e53aa3e747dc27e88b1e5ed663d0888c28676e21e5cbb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 0.9996

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 https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/fff1fab712903144dfdfd3f0ef9b2e86/30835815675.pdf In PDF document text
    • http://allycatering.com/userfiles/gepolemedajubapigopos.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/39d954615168be295584ed5bf4559dcf/sepafanomuzadubowojolek.pdfIn PDF document text
    • https://stopserv.ru/files/file/23718180495.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/mjptglfb7anrqiq9981c36m441/modemixunabujotiten.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/0u0dtrngi2ufn5v8n8kfl7d866/44393637222.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/c4d01f9cc9dd67429cfee500fe412861/fewita.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/xagitamolafidinopibixe.pdfIn PDF document text
    • https://feltshoe.com/userfiles/file/rufopujafigiziwuda.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/da6e98e738399aad063758c1098a2d9d/doduziso.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/47210708449.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/6ce1a4c12dfbff7bf32484e9214f2b29/62568916908.pdfIn PDF document text
    • http://clasesholandes.com/userfiles/file/59734608084.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/87c6b681e26985a57d1ce8dc976247f6/55288860730.pdfIn PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/risofagumasevowigunojubuv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=coc+town+hall+6+farming+basePDF 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://scripts.sil.org/OFLIn 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_off0000d9d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D8 5584 bytes
SHA-256: e7c21e09d383fe6731014c2c1517e55eebe1ec81db4e0ed445a2d29c326a958e
font_01_sfnt_off0000ecb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB8 2808 bytes
SHA-256: 2480730ecbcdae8df29709a35f0ff8183bed07422e69f9ff888da9647fb12798
font_02_sfnt_off0000f8b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B4 19508 bytes
SHA-256: daf791b3356b411b3c6897177f9352b4a72ce8b6d941091a8e42fb8af3629d76
font_03_sfnt_off0001280b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1280B 16344 bytes
SHA-256: 7e0863d6dcdfe3ce59f67395a06e5e8634226e44f713773c85e494ff6d119ee1