Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd531bf65faec66b…

MALICIOUS

PDF

152.5 KB Created: 2021-06-29 23:23:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 004f3f75565facd18a430f0ea4f851c1 SHA-1: 493991af24e898af1fce2a59203ae74002fa37c6 SHA-256: dd531bf65faec66bbd2c140aa63e3dc2c7db5a093036103e0d6baf955c399dd8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous links to external websites, many hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the overall structure point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9838

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://ketchas.ru/uplcv?utm_term=chip+design+for+submicron+vlsi+cmos+layout+and+simulation+pdf PDF link annotation
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/063abf03c937822c5a60e408702f3e84/lewefom.pdfIn PDF document text
    • https://tavio.ru/files/file/zikebiwetimo.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/81a1e8ebc3835ea6712d12e022a7d353/pirivifukumav.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/duth7ji5i128brk7v589q44ej4/nixasivedawurirapipapebuv.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5eb2c4b1e---66246985964.pdfIn PDF document text
    • http://asustainable.com/global/file/pulijit.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/ri3h8adtbp8mkfk2h2u7ar09ks/vunimini.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160709ef341bb4---12362607844.pdfIn PDF document text
    • http://homenet-spb.ru/userfiles/file/83927228382.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/sekexiponivogetoro.pdfIn PDF document text
    • http://alexanderjamesbackcatalogue.com/userfiles/file/58514499377.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/krf0klqt3umfir0glffp0lh6ms/jifemuwunezowutepakisixat.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/33f40f6a0f4599905502541f334b9156/3244885926.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/zifogoran.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160789bc235853---nokobevitupu.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e029b0a77---kapedowunox.pdfIn PDF document text
    • https://mygoaltv.com/ipp/images/uploads/files/56121306627.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/52763276381.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/tuborexivonamibajetatixab.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/50804545964.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/kibesidafurororezil.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609ebb559c931---niwirapo.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001da76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DA76 11516 bytes
SHA-256: 65102cf9a0a0dc3767d8ec3666e1f0eb2ca89581e4f244c35862d9a5f884d8d1
font_01_sfnt_off0001f530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F530 20940 bytes
SHA-256: dabeaf39440572b39a103fee1b773fd03076c4dcc8314b4b2a8bf4489c6cbe2c
font_02_sfnt_off00022c7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22C7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00024489.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24489 3676 bytes
SHA-256: 42cf6a92b96a8907bd5652c6bad2ca8ead6b02337728a14381eaced0fb0fb0f1

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