Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5ed04398ccac8de…

MALICIOUS

PDF

74.9 KB Created: 2021-09-03 23:17:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 26059dc74d5a65b68aae0fccca95d9e2 SHA-1: c38ccab31647a0669059f08cd40cde3a0b558db5 SHA-256: c5ed04398ccac8de482bbb428e98be4be725685113a0573ccb061bac4ef10e87
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/52ff05f2029a2b3d87bb903e9a59f5cc/49597731281.pdf In PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612a4194efd7d---xokedexokedowalozizijopot.pdfIn PDF document text
    • http://csc0451.com/userfiles/file/20210702054406_gwbyyy.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/17934337541.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc8b14f08f---dinadinunadunu.pdfIn PDF document text
    • http://npxbyy.com/wang3_3_10_27/Upload/Upload/file/202153054344835.pdfIn PDF document text
    • https://usssecuritate.ro/userfiles/file/sesug.pdfIn PDF document text
    • http://tycoonmedical.com/userfiles/file/4804602643.pdfIn PDF document text
    • https://i-chat.tw/js/ckfinder/userfiles/files/4251615040.pdfIn PDF document text
    • http://nowator-zpu.pl/userfiles/file/10687108798.pdfIn PDF document text
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/87885571596.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8b9d145014---47346458029.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/3628342142.pdfIn PDF document text
    • https://muachungbaohiem.com/uploads/userfiles/file/57873982350.pdfIn PDF document text
    • https://yepsell.com/userfiles/files/wuvarukamaroliwalero.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/8ffbaa0c90525c58303a86fcce1ab065/4697264306.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b17f1cdc21---mufunetezisodanud.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/e522f5bd43a94d900ba918b42db3c589/52440934014.pdfIn PDF document text
    • http://karpatskiles.ru/store/files/2684804376.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/20835154078.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16121397fcf069---15334997789.pdfIn PDF document text
    • http://win-sonic.com/kida2018/ck_imgs/files/mumax.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/ro9873ct11gojeoe5rtmptj2t8/79193638703.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=american+english+file+second+edition+pdf+freePDF link annotation
    • 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_off0000c64b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC64B 11048 bytes
SHA-256: 60e501b960d708943e005ff2545ec9df5e544c6203c6879546d9bd3f9fc7f2f1
font_01_sfnt_off0000df94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF94 17412 bytes
SHA-256: 49abcc942492710e0a51d7f87f67685d3c86be8c9b6ae0c3d914a7ac5832164c
font_02_sfnt_off00010cca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1