Malicious PDF — malware analysis report

Static analysis result for SHA-256 a016babbd2a6346c…

MALICIOUS

PDF

85.1 KB Created: 2021-09-13 05:08:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: dd54b2cb336cf964b8cd6a1c86f1b754 SHA-1: 084dde8ff762c76ea57a04f31e3aca89c0caffb2 SHA-256: a016babbd2a6346c9426160a58a4471d294cf2012478e3243345ee80851a0fa6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links, many pointing to compromised or disposable hosting, indicating a link farm designed to redirect users. ClamAV and ML classifiers confirm its malicious nature, likely for phishing or malware delivery. The embedded JavaScript is a primary mechanism for executing malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9780

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 http://blgjad.com/upload/files/damegadetigabosezu.pdf In PDF document text
    • http://mikailang.net/userfiles/file/20210902154345_2107231462.pdfIn PDF document text
    • https://jss-moms.si/upload/File/11724598755.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021091307581629.pdfIn PDF document text
    • https://regiefranchet.fr/userfiles/files/47802696723.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9aa6b2587---nitujamelota.pdfIn PDF document text
    • https://digireg.es/upload/pepise.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0f014deee---79843616868.pdfIn PDF document text
    • http://geodavidepini.it/userfiles/files/65369912134.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161319a6962c52---76829750989.pdfIn PDF document text
    • https://fratellifurloni.it/file/74253072028.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/47075736911.pdfIn PDF document text
    • http://bluebiz.kr/userData/board/file/8109656370.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/14207486966139518dc5bf1.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/9196759539.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/89777094398.pdfIn PDF document text
    • http://ajej.pretty-match.com/upload/files/10512918412.pdfIn PDF document text
    • http://daegyung.kr/userfiles/file/20210902224625.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/420e179964da3d9f264e3826fd3d7cbe/kedamidasajuzatibufegeteb.pdfIn PDF document text
    • https://cuacuonbentre.com/upload/files/98516787206.pdfIn PDF document text
    • https://ataru.site/js/ckfinder/userfiles/files/didefo.pdfIn PDF document text
    • https://cafesca.info/ckfinder/userfiles/files/26216958753.pdfIn PDF document text
    • https://kocarbon.vn/luutru/files/44636752101.pdfIn PDF document text
    • http://candybeauty.vn/upload/files/43853983837.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/fobofisirofu.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/daxowezemugadelufeledi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=kwgt+kustom+widget+maker+pro+apkPDF 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_off0000c83f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC83F 16360 bytes
SHA-256: 84657a3efcf4a0ab380e0b6fa06397548231176f28a193c530d867b23635eb41
font_01_sfnt_off0000deb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB7 10852 bytes
SHA-256: 0ec5f3dab6c7e8f10bf8c8b69f21a97ef690420e961ed224a989d6466cb17f8e
font_02_sfnt_off0000f7af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00010fc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC1 20968 bytes
SHA-256: 4060ff4682bef96ddb9b178b9e02e0a09aaba23d56bac7de99568ce7d62f4890

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