Malicious PDF — malware analysis report

Static analysis result for SHA-256 8870bab8ef1dbdda…

MALICIOUS

PDF

72.4 KB Created: 2021-09-06 14:08:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8fd1790e03534be0033d03a472958e36 SHA-1: f577aa2db9c7a4812a262d4ea2aaa1e2a83de3b4 SHA-256: 8870bab8ef1dbddac471d9fb4c06f6c8bf7bb4e13c3b488e958eec9c30e42412
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs pointing to compromised websites and link farms, suggesting an attempt to redirect users to malicious content. The presence of embedded JavaScript, though not fully analyzed here, likely contributes to the malicious functionality by facilitating the redirection or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

Heuristics 6

  • 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.
  • 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://crewmak.ru/uplcv?utm_term=modern+admiralty+law+pdf PDF link annotation
    • http://www.kickcommerce.com/userfiles/file/penozafumijuru.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079099b6dd5a---sobuparinepimofixoxo.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/3874d79507a5a509ac055ba4f8e61849/1317567995.pdfIn PDF document text
    • http://dexgerm.com/data/file/userfiles/files/moponuw.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/28f03d82f370c24f3b82bd0fa4a59f06/68584850849.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/d0c5c7b30200deb159c27ec9dfa78e35/voxokot.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/79092368804.pdfIn PDF document text
    • http://oilandgaswork.com/userfiles/file/11460310952.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210702080115575.pdfIn PDF document text
    • http://dvg.asia/ckfinder/uploadfiles/files/61213961669.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/b4a15c3f49700f4bda9912b1d4a3fff0/97370519837.pdfIn PDF document text
    • http://americandeliorder.com/uploads/files/43421609337.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/11421605432.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/24721f1f4409e1d59b65f6fb3db208a6/87908099446.pdfIn PDF document text
    • https://gangnampools.com/contents/files/gulisuwaviwudemawo.pdfIn PDF document text
    • https://europawindow.com/app/webroot/img/main_content/files/ratogegetoxevejoketiged.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/95472631572.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/xekibovekubem.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/ncv9b2agi8ki2498qvrb7qg49j/16943775609.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/4f8ccdc77080d99e016721573c0fef00/72466993042.pdfIn PDF document text
    • http://innobiztour.com/FileData/ckfinder/files/20210708_5CC8D43447EFB039.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/97770633818.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/7a6649860eebabfb3934e57af436f84e/64921221523.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/16299792370.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/81108380720.pdfIn PDF document text
    • http://home-delighted.com/user_img/files/gejex.pdfIn PDF document text
    • http://debschoen.com/userfiles/file/vikoferopudaje.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_off0000bb86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d39d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD39D 10684 bytes
SHA-256: 3c5675ccdccd3de8721fffa3fdb22d7c92692e2c223859f31a8142dfc9b3ad9e
font_02_sfnt_off0000ec17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC17 15852 bytes
SHA-256: b8cb88cb92eee0cea0ca632bb81dda8585ef037ae69a0a2fb037733ab4b8fd2e

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