Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dc35029ecb30c63…

MALICIOUS

PDF

176.5 KB Created: 2021-09-07 09:03:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 4fec290fe83ba9fac00721ee90c93c5d SHA-1: 8a624972a96cb5fed75b14bd458964934d050a12 SHA-256: 3dc35029ecb30c63e5cb86aef1d163ee17fc26890a5a5c892578aaf07744fc58
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites, suggesting an attempt to distribute malicious content or conduct phishing. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9738

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://oniceh.ru/uplcv?utm_term=hamil+muda+menyetir+mobil+manual PDF link annotation
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/thej70qvvot3imv9us2e20vdb5/bupisobe.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610e435ed6965---41061366529.pdfIn PDF document text
    • http://dahchen.tw/userfiles/files/gosipobisefadivivo.pdfIn PDF document text
    • http://langmypham.com/luutru/files/66440575286.pdfIn PDF document text
    • https://dpengineers.info/admin/userfiles/file/bidazafibizusumalemuvovex.pdfIn PDF document text
    • http://cetis156.neutronds.com/assets/js/ckfinder/userfiles/files/pakisuxipovigugukirut.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/4db52b618540ba9118f463baf96430c8/89912234233.pdfIn PDF document text
    • https://agermag.ro/mm/file/lesekeratonalef.pdfIn PDF document text
    • https://typeone.com.my/ckfinder/userfiles/files/27908558526.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/9533581941.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0292576001621911539.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0527ad4a0---69809438000.pdfIn PDF document text
    • http://aaz.sk/editor_uploads/files/gerinuvovapuge.pdfIn PDF document text
    • https://jamurgoreng.net/contents//files/53539697637.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image//files/16391860106.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4689dd312---jovenovugop.pdfIn PDF document text
    • http://sunnysideclassof64.com/clients/a/ac/acc4ccb49d7935ca36198347b895393e/File/tenuxijoni.pdfIn PDF document text
    • http://everettsbarbque.com/clients/b/b0/b0b566c85bab127526a414587b81487f/File/monujalatize.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/65066800058.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bc7ae00a850---87275924152.pdfIn PDF document text
    • https://bk.knu.ac.kr/ckfinder/userfiles/files/9352550562.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name//files/51741573579.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/87534336718.pdfIn PDF document text
    • http://pierrevillers.fr/mairie_files/file/jimuwuden.pdfIn PDF document text
    • http://twtime.com/uploads/files/202109011245152680.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/gubanivesix.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_off00025130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25130 10588 bytes
SHA-256: 0809dd34f78754a85482173154ab4355a70204c9a5615f1024ce32333d66e162
font_01_sfnt_off00026938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26938 18332 bytes
SHA-256: 6c4f681fb0e2f378acb10501b674b33ee0085cc143e098daa04ffbe27f247ba1
font_02_sfnt_off000299d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x299D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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