Malicious PDF — malware analysis report

Static analysis result for SHA-256 efdb556904d7dec8…

MALICIOUS

PDF

83.5 KB Created: 2021-07-07 12:33:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b0309eef089c9b83de6112152ee5dea3 SHA-1: 8bbd07b6c2131521e224e4f331530ab664acd4df SHA-256: efdb556904d7dec8bc99177b44428e5a08fa1cf7b7c5b7f650b63a8404c1f22c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by multiple heuristics and an ML classifier, and is detected by ClamAV as Pdf.Phishing.Trojan. The file functions as a link farm, containing numerous URLs that point to other PDFs hosted on compromised websites. These linked PDFs are likely designed to further phishing attempts or distribute malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/1eb1a9d4c17a26acfd45feefda710146/99642520874.pdf In PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/d671cf8ca9f77755dc4ac1760b6cbc05/60824952692.pdfIn PDF document text
    • http://ekhoron21.mn/uploads/files/53773633203.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/dikorinalenilivisu.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/48209048010.pdfIn PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/90047131215.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/4igo011ufo441br9of5ij1de3b/kopusomiva.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608a616d872ef---39087068528.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/446d4a3400eaa3d870ff48a338b258d8/13026862677.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/28322369348.pdfIn PDF document text
    • https://akemi.ro/hirek/file/jojinugejetusirila.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/bixinonofabigezawemobavob.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/marusopodosewo.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1607119d3df2cc---mukit.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/e85ac0d6160db9e61388f877a586d51d/ronozorobasosemanilofetis.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/30656078906.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/fevadow.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16074971b72d39---56287277778.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160975d85b9cc3---kurofufigugepufigexuk.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609054fb1af35---garogobodekofometa.pdfIn PDF document text
    • http://grandbarnettfamily.com/clients/a/a0/a01b80d98e57c38af56892ab55e7d82f/File/47746573693.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/e0edef1ee22ff27479bdcf4054fa79db/4457676203.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=dr+anne+cookPDF 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_off0000e455.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE455 9912 bytes
SHA-256: 822b01d412944a85310c47aeb32eeae781e820d7c1f04f67942b81b3adca89cc
font_01_sfnt_off0000fa4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4A 17816 bytes
SHA-256: f4d6639c5a495554242944864d30bf67bc00dc94fc0a85ec4b5265d997d54d8e
font_02_sfnt_off00012934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12934 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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