Malicious PDF — malware analysis report

Static analysis result for SHA-256 e677aa4e52db42cf…

MALICIOUS

PDF

73.7 KB Created: 2021-09-26 00:56:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2308796351da3ec3c996ad2c432297e4 SHA-1: 1736ba44d394212d30047196b20aa28f4a6fe6d0 SHA-256: e677aa4e52db42cf1cea1fca527024ce9912a51a0b6a455572fac2607882d858
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to various external URLs, some hosted on compromised CMS platforms. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM firings suggests an attempt to obscure the malicious intent through a large number of links on potentially disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

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://crysiq.ru/uplcv?utm_term=spin+the+robux+wheel PDF link annotation
    • http://oawebserver.com/piceditor/file/tumirelogajasuxebu.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/96658875912.pdfIn PDF document text
    • http://nwatchonline.info/userfiles/file/vogozejezuposibifojated.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f545ea7f84---razuguta.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/be31b2f31459d3a69b6267ba203e3302/gokogibik.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/92571598485.pdfIn PDF document text
    • http://bollnas.boj.se/uploads/userfiles/files/35649594514.pdfIn PDF document text
    • http://hide-bo.com/img/tmp/file/96175824046.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/161462201c2752---sevowavinenibazepi.pdfIn PDF document text
    • http://electronicaindex.nl/images/uploads/misevajarepuzugig.pdfIn PDF document text
    • https://dennismaloney.ca/upload/editor/file/demip.pdfIn PDF document text
    • https://macroedunet.com/userfiles/file/74338160977.pdfIn PDF document text
    • http://zamel2.pl/userfiles/file/donenopopubozije.pdfIn PDF document text
    • https://kaptenhoki.net/contents/files/65643523229.pdfIn PDF document text
    • http://emaaravm.net/upload/files/gijaxazirumowedujogagubo.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/74313605536.pdfIn PDF document text
    • http://ossokahve.com/upload/file/kowatalu.pdfIn PDF document text
    • http://xn----7sbev0bhje.xn--p1ai/images/news/file/viwuxonidizepajinabodabi.pdfIn PDF document text
    • https://ladulceseguros.ar/noticias/fckeditor/file/teligigeru.pdfIn PDF document text
    • http://zhongguohuachun.com/d/files/zepono.pdfIn PDF document text
    • https://linhquan-group.com/upload/ck/files/lepagifebenaradudopegadu.pdfIn PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/770975867.pdfIn PDF document text
    • https://rireenfrance.com/images/upload/files/10868107024.pdfIn PDF document text
    • http://xn--80aaaaadfwa5aftjhxrkcrg8iwc.xn--p1ai/pict/file/xojapogubiwabamuta.pdfIn PDF document text
    • http://thriftstorewebsites.com/flash/thriftstorewebsites.com/file/43715818097.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/a8f646d6b13c81ee8e807e87e42d681a/42070254958.pdfIn PDF document text
    • http://foxhill101.com/userimages/ramuxipafesemezikivisiri.pdfIn PDF document text
    • https://nguyenhungstone.com/uploads/image/files/48473250792.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_off0000bb34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d34b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD34B 10524 bytes
SHA-256: 0a215f75a2dbe03b22b750711db98fb0cc15cc8ea7f5323684eb8415a26a1b7f
font_02_sfnt_off0000eb01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB01 17892 bytes
SHA-256: d5002353fd9200fceca0326c392501442c126e1b022a914d73ce0da04e306ed7

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