Malicious PDF — malware analysis report

Static analysis result for SHA-256 0554ae80eae24cd1…

MALICIOUS

PDF

87.3 KB Created: 2021-09-06 15:29:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 84f8189736c39d864696d7ec2e884a16 SHA-1: 226e2cab7208e9ce0a6aa6bdde1b0262429e01f8 SHA-256: 0554ae80eae24cd161d94e22b6a06d37ee3d3e6b067f06c571ccec9060a1d1ed
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external URIs, many hosted on compromised or disposable domains, suggests the document is designed to redirect users to malicious content or download further payloads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a tactic to obscure the true destination by using many links and domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://drafthe.ru/uplcv?utm_term=data+scientist+resume+download+pdf PDF link annotation
    • http://malopolskiszlakwinny.pl/upload/File/zetufupafibupe.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/59693448763.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/wutarubimatometoxonop.pdfIn PDF document text
    • http://dichvugiayphep.biz/upload/ck/files/40267040720.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/bavurisodujevamuxopotaluz.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/rogqn7qgr3ocmq17kog4lfnhro/nivofakol.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/gezawu.pdfIn PDF document text
    • http://namjapizza.com/app/webroot/files/wurarajadedefobeke.pdfIn PDF document text
    • http://www.portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/fetujubilo.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0adf51232---fufufuguxux.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/83edc350a923b1d587dc900789ef8ecd/54212597655.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607333ce358a2---devuwokebazewavediva.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a78bd58da8c---62216529283.pdfIn PDF document text
    • http://xn--2-140-swe8h.xn--p1ai/files/29925763994.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/8d1848d717fff3564288ef1b6abb8331/mopuxemutimesimewiwodig.pdfIn PDF document text
    • http://onellenorzes.com/uploads/files/84531340981.pdfIn PDF document text
    • http://jdjcnc.com/upfolder/e/files/20210814051142.pdfIn PDF document text
    • http://whkmradio.com/userfiles/file/tamunajuki.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082ca2c1679d---37872627160.pdfIn PDF document text
    • http://agriturismofattorialucciano.com/ckfinder/userfiles/files/90175200765.pdfIn PDF document text
    • http://jl-vacuum.com/upload/files/tejawowowepus.pdfIn PDF document text
    • http://kavtas.com/images_upload/files/84070869153.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_off0000edc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105DF 10968 bytes
SHA-256: c9d7531cb4d9e79ed9257a65e885bb3a19ad831819eb7bce86c085aa5594ed19
font_02_sfnt_off00011f62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F62 18580 bytes
SHA-256: f48fd42a05a3b63cda146069b96e020c03d1a4b56853f14d1f093c417cd35536

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