Malicious PDF — malware analysis report

Static analysis result for SHA-256 630fb0778a21d938…

MALICIOUS

PDF

82.4 KB Created: 2021-09-04 17:50:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 58bba1c478adb14dc147d8482c568eac SHA-1: 79639c89fa9e4f6e6573eef35ad307ee354d4265 SHA-256: 630fb0778a21d93838df7e0cf3ba1c3d9c642687f0a0bab67f8d6b444753ff6e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting domains, indicating a link farm designed for phishing. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious websites for credential harvesting or further malware delivery. The presence of embedded JavaScript suggests an attempt to exploit PDF vulnerabilities or execute malicious code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://irlanc.ru/uplcv?utm_term=food+sampling+methods+pdf PDF link annotation
    • https://yingzhaoliuart.com/upload/file/7230260922.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/29362518617.pdfIn PDF document text
    • https://congchung7.com/upload/file/soguzapedizu.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/f20d8ipg6vs0sr2ulu3fjmi6p6/tewasiporemiferuke.pdfIn PDF document text
    • http://aliguoriarchitetto.eu/userfiles/files/kufapo.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160a4dfe3a0bff---3147498448.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/mebatetufa.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/wovit.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af53015f66---vekufixujupelejafovove.pdfIn PDF document text
    • http://confidenzacsapagy.hu/upload/goxilijizozobudipep.pdfIn PDF document text
    • https://rumusjitu.com/contents//files/tekibenenikovezor.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611d0f060a839---93478609068.pdfIn PDF document text
    • http://gianphoiduyloimodel.com/Images_upload/files/25801245623.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160812eea3f246---6110915419.pdfIn PDF document text
    • http://evergreendentistryva.com/app/webroot/js/ckfinder/userfiles/files/47217813741.pdfIn PDF document text
    • http://yongqingtech.com/d/files/30707148583.pdfIn PDF document text
    • http://bigsvatcharasith.com/userfiles/file/44715423300.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160772408b9a33---pakuzogovamamanidatakuv.pdfIn PDF document text
    • https://xenang-mitsubishi.com/fckupload/file/zekuxosavozoposoxirok.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085f300a4195---tomevowisiduxukoja.pdfIn PDF document text
    • https://cpsguffanti.com/uploads/file/33802458300.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_off0000dd9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9F 17768 bytes
SHA-256: e0c34d58794e3d0302b2dacd79bfff0ef15222fc93cd1c1167750ab16655756d
font_01_sfnt_off00010c0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C0A 10820 bytes
SHA-256: 63de01b05d7b00de68ea03f031394f9f8f1477addf983e44b3da740f45ab5c16
font_02_sfnt_off00012485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12485 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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