Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d12bdf7d1b26316…

MALICIOUS

PDF

91.1 KB Created: 2021-07-10 03:02:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 9737e65d13f8af0e43c4ae21ed04f772 SHA-1: 0412988502d37b02b232d14a0142739702e35954 SHA-256: 6d12bdf7d1b2631635bc8772ebc107ab2bbf696564d20845eb7139605dd46784
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised websites and disposable hosting domains. The primary purpose appears to be to host a large number of links, likely for phishing or to distribute further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://zemiigori.com/uploads/file/wabut.pdf In PDF document text
    • https://divinesacredshakti.com/wp-content/plugins/super-forms/uploads/php/files/34513ba8b0c0b79882fb1e37108d7ab6/gizagikapogiwojanimepizi.pdfIn PDF document text
    • http://www.cbs-emballages.com/upload/file/63392682790.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160707e147711a---difitamatir.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/sirewexinokemubuxa.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b73eeb4392fcf8e9f08310d8f62582e6/42339549592.pdfIn PDF document text
    • http://texmet.pl/userimages/file/38705455790.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/2loo97r0pcn581rqsbvpogq9tu/36719458209.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/f393ec000621753c134dcc5123d93f69/duvupigukosuvuji.pdfIn PDF document text
    • http://berbun.com/user_img/file/64439897722.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160a58c16350d9---dagoru.pdfIn PDF document text
    • http://hrt-foto.hu/_user/file/vikelinibi.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/fcd835adf0ed5927c22e7f40801975a9/37705463213.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/jexokupifipaxofazikeduvig.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b245cb078---38629533625.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/5aa8f430cb5b9be0deebb1cb3fc72869/ragonurewidezepowalefubax.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2c2ebbf7e1eba05cc75cbecc6ccc5b64/nepezutepiwozifiga.pdfIn PDF document text
    • https://condicionamentofisico.com/arquivos/file/35959800459.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/l3gvncjh43tgaes66rfh4bpmh4/mumenuwimi.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/6bd7b397ae1febbd67b9981f31c88ef0/tifiperodogaj.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/972b81438a5a73cacdf61d9d0f1e1f16/53050508087.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160847d5d5577a---wogazuxabozid.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/taxotu.pdfIn PDF document text
    • http://halmar.info/userfiles/file/pidolenadokefon.pdfIn PDF document text
    • http://xn--80aamdqpfpr.xn--p1ai/upload_picture/84142301204.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=level+9+town+hall+max+upgradesPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ffcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCB 17192 bytes
SHA-256: a4bcca5bde21b7146b3d496cc1887ca1c436a9677ff90e7c70bc8db6af59f588
font_01_sfnt_off00012cf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CF8 11224 bytes
SHA-256: 6a660612efac007df437b4d7a4cfcaeadae380164ff6d61cf439ab04610ef687
font_02_sfnt_off00014700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14700 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1