Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfa757eebf33b70a…

MALICIOUS

PDF

102.3 KB Created: 2021-09-08 11:30:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 18e45c44652859fc0cffa91e90338fc5 SHA-1: bb2df722a25b6b30449c6666ebb03482b86e53e2 SHA-256: bfa757eebf33b70a31d58ff0b33da2270031685a176b076b20e766e0f46bfb43
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous URLs hosted on compromised WordPress sites and disposable domains. These links likely serve as lures for phishing attacks or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://coretry.ru/uplcv?utm_term=alternative+energy+systems+and+applications+hodge+free+pdf PDF link annotation
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160fee3a76fab5---zapumuwapoxitopuvagonoj.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/694216c241b4b302aad3afa015046fba/tudunetapirivagidol.pdfIn PDF document text
    • http://mexxeopaint.com/upload/files/lobopepesebaxer.pdfIn PDF document text
    • http://nenorm.com/files/files/penajimifemetumamijikugo.pdfIn PDF document text
    • https://casalindasbakery.com/ckfinder/userfiles/files/56285275457.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/161107be3b8e14---dazojogibadekazis.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/72981213519.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098acaf029a1---98695578733.pdfIn PDF document text
    • https://drlanda.hu/user/file/83529908206.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/0ff1121e4ee86eb1fcfbcdc8e885b648/kodajujix.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/venatuwak.pdfIn PDF document text
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e2848be8dd---41978913924.pdfIn PDF document text
    • http://easternhoteljeju.com/FileData/ckfinder/files/20210829_175F66651F17A22E.pdfIn PDF document text
    • http://movesearchesuk.com/userfiles/file/nomuresuxojitowew.pdfIn PDF document text
    • https://masihpt1.com/contents//files/wotewoxa.pdfIn PDF document text
    • http://614move.com/clients/4890/File/1945533004.pdfIn PDF document text
    • https://abrasco.org.br/ckfinder/userfiles/files/34723563499.pdfIn PDF document text
    • https://mollis.rs/files/72475332873.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/5olb6a9hc8ao0ld0nbkg47do3v/mizimotufiluz.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160890c3552b16---degukitepewefowoso.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608597d9d345d---5638980145.pdfIn PDF document text
    • http://12shio5.com/contents//files/lemepexasaxajuwepetakote.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/e2964c2bcbacdc2a5b7a4be5f975256f/51602087000.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa6bcd8df2---93687906996.pdfIn PDF document text
    • http://izdo.org/img/userfiles/files/71071369608.pdfIn PDF document text
    • 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_off00012a9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000142b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142B2 11228 bytes
SHA-256: f6ffbbb9af94be25874b3573101a5b585276d6d14ab1921bf647878d924bcab8
font_02_sfnt_off00015c9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C9F 17704 bytes
SHA-256: 36ac5969713aa9eeeb3c451893975e64e26ffa7a94c9bf04a9a6efcd820430f2

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