Malicious PDF — malware analysis report

Static analysis result for SHA-256 0eeef138f49055f9…

MALICIOUS

PDF

74.5 KB Created: 2021-09-16 13:18:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3760d6a384145acdb105a45bfb2e907f SHA-1: 091636549f9ad7ef1aa892778b91d5957bc812ee SHA-256: 0eeef138f49055f995bf08d9c9ad9cf323e8080264560d37ebb90c04187124cb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. It also features numerous external URLs, many of which are hosted on compromised websites or disposable domains, indicating a phishing or malware distribution scheme. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://infrive.ru/uplcv?utm_term=life+cleric+channel+divinity PDF link annotation
    • https://ceramicasvillaflor.cl/UserFiles/File/62396986098.pdfIn PDF document text
    • http://hotelrealerimini.it/userfiles/files/sazorebure.pdfIn PDF document text
    • http://xn--b1adbbbaeqjtsflbfms0e.xn--p1ai/pict/file/17396412675.pdfIn PDF document text
    • http://mikomisushi.com/uploads/files/rubumaxamasogopebupazuxu.pdfIn PDF document text
    • https://nazragame.com/calisma2/files/uploads/54966853958.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/zepiwa.pdfIn PDF document text
    • https://maffart-guy.com/userfiles/file/lukaloxebov.pdfIn PDF document text
    • http://m-styleauto.com/js/upload/files/zaliw.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/cq23re0kr4hpk72qv9olk51kgd/sovudisopaxitezeniberix.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16139eb755f84e---92896926910.pdfIn PDF document text
    • http://ranchobg.com/img/file/53091703890.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/11630234526.pdfIn PDF document text
    • http://savytrading.com/userfiles/file/kunafoj.pdfIn PDF document text
    • http://sumbulefendiegitimvakfi.com/resimler/files/87728604798.pdfIn PDF document text
    • https://dazhonghua1688.com/ckfinder/userfiles/files/vefijuzekede.pdfIn PDF document text
    • http://hbisan.com/userfiles/file/18889965442.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/k5osfnvr1kotk0p4sdsciep3rf/gapalagezuvitiruk.pdfIn PDF document text
    • http://xinghui.co/upload/ckimg/files/202109131726506582.pdfIn PDF document text
    • http://toszegisuli.hu/userfiles/file/runopinezitosedirogibiri.pdfIn PDF document text
    • https://snoman.mb.ca/ckfinder/userfiles/files/40940713469.pdfIn PDF document text
    • http://bocghedanang.com/media/ftp/file/13874320401.pdfIn PDF document text
    • http://jinanxintiandi.com/userfiles/files/vemorusiwejomeregigon.pdfIn PDF document text
    • http://hmconcretemixingplant.ru/d/files/90706503072.pdfIn PDF document text
    • http://philboyd.com/57336052310.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_off0000c1a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1A4 16936 bytes
SHA-256: bd73d3e2e5ab4ace607292f89d1408dfa0d23fa9154b90ec738cb73a48a223b1
font_01_sfnt_off0000ed61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED61 10424 bytes
SHA-256: fac13aca580ad568883ec19a03e31f6ffcd3497dbe4f85f7a698cb26a7b00ec2
font_02_sfnt_off000104ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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