Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4ad924516ece623…

MALICIOUS

PDF

83.9 KB Created: 2021-08-13 15:17:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 4e6b2d027cb1af6721ef3a830dc64d7d SHA-1: 05b9a55af1d41ab6748a5f62a84287161a0832b1 SHA-256: b4ad924516ece6236fdb4117619c9e6aedadb9ef1075a299e7173afd9f46b707
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/719b738c4ee00147b9699e3d6db6e700/54479081418.pdf In PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/del3bcc4je3pg7g8a7cjf9kjus/77764088749.pdfIn PDF document text
    • https://mayxaydungthienlong.com/uploads/files/files/finolukimasilokadunat.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/85004165596.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a50e7b2bf6---sapilipujerugojidej.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608598f2b5b70---41961101181.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/23829840247.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083a8df24762---99209523962.pdfIn PDF document text
    • https://gruppopolidori.com/upload/image/file/kowosiposupovalobite.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc2405f892---46876910097.pdfIn PDF document text
    • https://suncables.co/images/file/59440453239.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8d65430e4---visipadawoverirepuveroz.pdfIn PDF document text
    • http://soflocops.com/clients/67403/File/sidowugipujanelubifeled.pdfIn PDF document text
    • http://churchtextile.com/userfiles/file/66879573064.pdfIn PDF document text
    • http://hoangminhceramics.com/app/webroot/uploads/files/tafajovoxusop.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/g47birr267cfj8c5fk0igk3a27/bojarelobupufetadidew.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b098dd923b2---83564995926.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/gomadobomerunosipojuz.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16082afc378679---kowepesakijalilupusaganaj.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16097e7bfdf895---kilumejobita.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/dapejebowowomagexizuses.pdfIn PDF document text
    • http://orikon.net/Images_upload/files/garusetofuponen.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/getijujetewa.pdfIn PDF document text
    • http://apcmagon.com/userfiles/rutegotu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=round+midnight+piano+solo+pdfPDF 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_off0000e147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE147 17480 bytes
SHA-256: c8edc9c7523b0febb90e299401638011a5277d573afd2d2421ffdadb55238b05
font_01_sfnt_off00010ef6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001270d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1270D 10856 bytes
SHA-256: 41ebc44ee256497365a7fcc4f627d44d0421cbe442a34bad3d5e7c683d02ebcd

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