Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b890a57cb1f392f…

MALICIOUS

PDF

80.3 KB Created: 2021-05-06 18:16:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 6255648e16dc523b5a373a422ed67269 SHA-1: 33c470c11db665ea491746c3506ee7893c4add51 SHA-256: 1b890a57cb1f392f2996f7cc943517f82abfed782e59383ae9d9c69220d7bee1
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 0.9998

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://ailani.org/wp-content/plugins/super-forms/uploads/php/files/40d3901dcc69d364cad53f0648765443/wulixejibenafirurujomexi.pdf In PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/uvs6iqdhrs301j0fkn9902i4h0/60485727864.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/612b8deeb6f7d3b817b8faf854ebfebe/riwudulalo.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c85f5f2222---83589327576.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/96436526316.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e7413a40a---fabaxevelugesuze.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/60695941128.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/33384440430.pdfIn PDF document text
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/r36r1k6n8abup6oc9dpaje7rqg/punawufajim.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606d57361c173---mitafumizupon.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6caf1dd93---nebadutikijidalumozomimuw.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/bfd23fc42045dd305ea9b3ff813a8522/kijizoditokejujeges.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160900d9924e13---xemen.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608f032e1b077---puriwuzefawimetufezod.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160746f2849ea4---74970582056.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/LPIa9PGmDLg/uplcv?utm_term=united+airlines+baggage+information+domesticPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE488 5472 bytes
SHA-256: dcfd33c0101955e392dbaea089eb9ae39be21bccad7503f4e0218303ff1de8af
font_01_sfnt_off0000f718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF718 11308 bytes
SHA-256: 8720658c2321ea0e0a53562c422f877e44711cee294b993707d6ff653e7b87fa
font_02_sfnt_off00011e06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E06 16232 bytes
SHA-256: cb0239a5e77cb37740da0b4997a5f47117ed526887f952b298c44ef8b2f17e18