Malicious PDF — malware analysis report

Static analysis result for SHA-256 1534445c8d8d4219…

MALICIOUS

PDF

86.6 KB Created: 2021-07-03 12:23:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 3a507673126a3c01d7b47c0418ed9782 SHA-1: 3cb8c58e654f8179cbe0d08bd93c4ebdc1f205f3 SHA-256: 1534445c8d8d421998c44c9635978561399989deed8e97775f153624f760dd54
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress uploads and disposable hosting domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://ibconsulting.it/userfiles/files/kemamal.pdf In PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/16085092333911---gexaxuzegotowefokudiranik.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/93489071307.pdfIn PDF document text
    • http://cmtsport.com/pliki/49059169855.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/wekumapavepisokoguxir.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083fed2974d2---luwaliwar.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/83ac58e2d525138466fc0624d202e9f9/32370651253.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1609db139b7cc6---2029049543.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ikhtmd1oir7qldlo4f6nu63a66/vukewotatatesixexaluxuvat.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/13635005a2c1a8670b0e3d849d9a9187/zosozopaguwikedotufefen.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f7c31982f---96573295955.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/godunu.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/89498476262.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/edb57a2384aacd6d09a5b726a548c9dd/54981923170.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/f7a7a976f3892aa57b5eaa9cc7affc4a/tawon.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/b09bad281df21ebbc4ea921af7d91f9d/pazeledetowoxivubu.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1bc6410f4---4455379699.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/27daa189352e2a3dc1d1ddddb14a7d99/mejajabitaxeribiwavidaji.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/44quhlimtn130td9r8p7cse8g6/10007963668.pdfIn PDF document text
    • http://linuxnewyork.com/draft/media//27380836177.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160c998e442a84---39694268403.pdfIn PDF document text
    • http://apricomm.com/userData/board/file/kabozawetuf.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160dce9a228226---33558267048.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=latest+released+movies+2021PDF 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_off0000ef5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5A 10620 bytes
SHA-256: 8795cc75cb7c71ea6a7bda2d8745d2badc198662a10ef9ce763ad6bd8376b2ad
font_01_sfnt_off000107bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107BF 17624 bytes
SHA-256: 176ea70dae7cca701c4001dfec42986a1d5ae70ea916b5c642fc162afca124ee
font_02_sfnt_off00013575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13575 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1