Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbebf596e94aea80…

MALICIOUS

PDF

105.7 KB Created: 2021-06-27 16:47:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: c1cc4b5197ca852d12ed6d9ca18d9478 SHA-1: bb485f75cb107d84fa28de01cbf870e92390c72a SHA-256: fbebf596e94aea8076a3a4e7871451b90d52949b202961fea4a39703e8d7f766
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains a link farm pointing to numerous external URLs, many hosted on compromised WordPress sites, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the overall structure strongly suggest this PDF is intended to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://thuaphatlailongthanh.com/upload/contentFile/minhchau/file/fabuliga.pdf In PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/875ab911f428a41335772e1dc04220cc/zobesugizerad.pdfIn PDF document text
    • http://hyundai-dongdo.vn/images/files/dejejefuzavabajigijifomop.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/5d6fcc99f0b98868d008a87eb580f984/36275387235.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160d800a9a0aea---dubifevixavev.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084bce9c2e76---76457114846.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/b28ea98c49cafd8ab1a38627f15eeea7/57809471116.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/gupivuvawalamilokagorosud.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/849f8213eb8842d278638af676cdd156/82914422384.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/e94b5992b6e449ed8c31d18e9fdf7eca/puzufekadupomevanoxobe.pdfIn PDF document text
    • http://tv-kitchen.ru/files/files/sidet.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/c72ea59d8edddc6123162390fa93e0f6/60963250265.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/30167177970.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160715dcd3f632---67838026963.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160975b16d167e---mefuveleniwesaw.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/a9bd4fb18f1d14f0969a79d0dbd4a6fc/wajamominuwabi.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160908957a884c---gajubopimonizededenobe.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afad5a93415---82053933254.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/40355320675.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/26797983823.pdfIn PDF document text
    • https://blindnow.com/userfiles/file/mexizadesonoli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=moderate+gram+positive+cocci+in+pairsPDF 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_off000137e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137E6 18972 bytes
SHA-256: 0ba699bc9c1e0dd5714dcf54932aa30d9aceab92431711d15e863ab5021620d4
font_01_sfnt_off0001684c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1684C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18063 10868 bytes
SHA-256: 5b6d2a5e2757401ae52985f7abfaafb0d8576cf92c3b660c78a1058e6fa5ac4f

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