Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb8c86d1b3aca556…

MALICIOUS

PDF

70.9 KB Created: 2021-09-03 06:32:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9bc6e7fc163e448c050dfd89bf6d5dac SHA-1: 43fd98dae5e0d5be2e81f3984f58f57b76bbcb82 SHA-256: fb8c86d1b3aca556298b342b08262c28466f4edf9094ca927dbac39e0e94a9f8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer, likely to redirect the user or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://chcial.ru/uplcv?utm_term=biology+pdf+notes PDF link annotation
    • https://khonggiansangtao.com/platformecom/img/upload/file/22836202104.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/xazadegesugolewub.pdfIn PDF document text
    • https://arerp.kr/data/file///92272035639.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609df6cb2d56f---29262416711.pdfIn PDF document text
    • http://thechelseaff.com/user_uploads/files/fasuvizobejesasufak.pdfIn PDF document text
    • http://kavtas.com/images_upload/files/68822000491.pdfIn PDF document text
    • https://thegioibaobicarton.com/Images_upload/files/93848057373.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/v1akktcsus9k0qisstkd5gkp32/17246926716.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090738af3de4---vuxavew.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///dunekef.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/46960646467.pdfIn PDF document text
    • http://gok-maciejowice.pl/js/ckfinder/userfiles/files/77039690703.pdfIn PDF document text
    • https://podimercrm.com/img/files/12839270369.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/75497533517.pdfIn PDF document text
    • https://keepingscore.org/userfiles/file/mijurex.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/3680569755.pdfIn PDF document text
    • http://africa-emergence2019.com/userfiles/file/jegibosoxovejijoxexol.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/52306caf592fb91510baae031dffb2cb/suwawixibomifor.pdfIn PDF document text
    • http://blessedfamilycovenant.org/clients/c/cb/cb727bc273eb4203dc66fb73741ae5ae/File/8981470821.pdfIn PDF document text
    • https://cecprint.com/images/file/pariwedus.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/df82d096ac46fda83ef01f2e935662c9/kilotatikor.pdfIn PDF document text
    • https://bjjewels.net/nbloom/fckuploads/file/91465635859.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_off0000b7df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7DF 15100 bytes
SHA-256: 22efb0accfbc73ccdac4a7861826ff61f6eda046bf64bd7cd02847f79512b35b
font_01_sfnt_off0000ddda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDDA 10576 bytes
SHA-256: b2a4c201e3665b1213aa7999bd6c81e2b352138abd4027ea9f731dda4dca49e3
font_02_sfnt_off0000f5f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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