Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa22a56032373a44…

MALICIOUS

PDF

80.4 KB Created: 2021-09-23 05:54:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: dcd8722c4bcb0b74c72026eba1deb766 SHA-1: d9b96ad9888a641ef4bd40a776283ed9e791d7e5 SHA-256: fa22a56032373a444fdd0cc0f16219e76ae8dfbb96f7b43da4a1d5fd2bbe41da
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. The document contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload directories or disposable hosting, suggesting an attempt to host malicious content or redirect users. The presence of a download button lure further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://catamma.ru/uplcv?utm_term=pinball+xp+apk PDF link annotation
    • http://amicalelaique-guyancourt.fr/ckfinder/userfiles/files/30524947506.pdfIn PDF document text
    • https://mehfermobilsaglik.com/userfiles/file/66237854387.pdfIn PDF document text
    • http://trevelci.ru/ckfinder/userfiles/files/bovoruvubuvagi.pdfIn PDF document text
    • http://studioambienteterritorio.it/userfiles/files/17886850920.pdfIn PDF document text
    • https://www.hippocratio.gr/ckfinder/userfiles/files/koruregedizofuf.pdfIn PDF document text
    • https://mehfermobilsaglik.com/userfiles/file/22677049754.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146b671ef99b---79240994043.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/jgnti3b45jjorgmmmi70onttng/96606836025.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/67338326312.pdfIn PDF document text
    • http://totoquynhhuong.com/upload/files/98167899762.pdfIn PDF document text
    • http://www.sictombbi.fr/ckfinder/userfiles/files/pudag.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/47012973495.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16139aae0b4f71---vapovuxu.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/5e38a3547a2a053c184047b0acd97a88/digatosalewenewupab.pdfIn PDF document text
    • https://limblength-sldf.com/userfiles/file/rimuku.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16140f29449bef---73596789697.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/7254055039.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/2q3a6fa66acen59cu4mrcbndkj/84034745862.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/lazosetepuxiw.pdfIn PDF document text
    • http://szpital-sulecin.pl/images/fckfiles/file/sovarug.pdfIn PDF document text
    • http://edilgroupdigiovanni.it/userfiles/files/60089923839.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/91242424865.pdfIn PDF document text
    • https://grandegroup.net/files/15853392595.pdfIn PDF document text
    • http://tantos.jp/js/upload/files/zobupap.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/7935870eecf83aeb296fbc815c419dc9/rokevinisure.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_off0000d658.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD658 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6E 9960 bytes
SHA-256: 7e4bb8ca764f4090a9d0a4071c62c8489a85e31f9c9a1d49b6dc7d04315365f7
font_02_sfnt_off00010431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10431 18488 bytes
SHA-256: da15e8c0ae5009529dc0adc94fb11a60ce17375007f14a2cb18aa70aa57deef0

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