Malicious PDF — malware analysis report

Static analysis result for SHA-256 d27511654e5d00a2…

MALICIOUS

PDF

79.9 KB Created: 2021-09-25 04:18:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8bb3f6f5fe203accb1613e2251fa5577 SHA-1: ccb3c6d1b1b2c3c686788b1bfd7d4587f9d3804f SHA-256: d27511654e5d00a2acea51bdb8baba636e5d72e6ef543203e0e9fd6e84862859
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple domains, some of which appear to be compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9764

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://argentinaproduct.com/ckfinder/userfiles/files/32972336092.pdf In PDF document text
    • http://stringquartet.biz/web/images/fck/file/71343870256.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/jogukadebujibovipebew.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/a0d0ddf39bb8a6f87e623228a7a85648/suxoxiduworibisunanu.pdfIn PDF document text
    • https://chrmglobal.com/userfiles/file/89745963361.pdfIn PDF document text
    • http://chpcentre.com/files/file/dimovapafabunosetar.pdfIn PDF document text
    • http://at-studio.tw/app/webroot/userfiles/files/20210909_223254.pdfIn PDF document text
    • https://tmtteks.com/files/61576943850.pdfIn PDF document text
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/xevenurovijuloxojekiwi.pdfIn PDF document text
    • http://standartbio.com/fckfiles/file/kewupo.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1613334d05ea37---57959279950.pdfIn PDF document text
    • http://446888.top/userfiles/file/pixilazazukaronubovutazuf.pdfIn PDF document text
    • http://medicalproduct.hu/images/files/40416382070.pdfIn PDF document text
    • https://iword.de/userfiles/file/24081685565.pdfIn PDF document text
    • http://teen.plovdivweek.com/js/ckfinder/userfiles/files/61990374372.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/97525634792.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/702ee311a82f893f3cb4412ce3c9747e/33663774493.pdfIn PDF document text
    • https://mimpiindah1.com/contents/files/89772259385.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/kafikimasexiwoluk.pdfIn PDF document text
    • https://wspaperbag.com/userfiles/file/lebusebasip.pdfIn PDF document text
    • https://khabul.mn/mmpa/userfiles/files/67693306286.pdfIn PDF document text
    • https://orangerun.re/photo/files/99119672001.pdfIn PDF document text
    • https://magerp.org/upload/files/41795443323.pdfIn PDF document text
    • https://gencshoworganizasyon.com/upload/ckfinder/files/xoxagajokejadaguneku.pdfIn PDF document text
    • http://retrolondontees.com/userfiles/file/zubowizuras.pdfIn PDF document text
    • http://queensparkview.com/image/upload/File/puzivejuvenelivosanawat.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/25828394698.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=backup+photos+android+cloudPDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b64f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB64F 10724 bytes
SHA-256: 2ab834c03644c8d4a7351374be6c0e1fed62848534ecb04ebbb3635e851723e7
font_01_sfnt_off0000cee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEE9 18432 bytes
SHA-256: fb749cb4e07d451f619b6d0ac0602c24e3896436d6ddc36b8486070f4c46a4c7
font_02_sfnt_off0000ec84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC84 17484 bytes
SHA-256: 7c69e9ecae481f0406c73f3a53e9d52ad1ba07d96fa27a36372a28c0ee8d0be6
font_03_sfnt_off00011970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11970 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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