Malicious PDF — malware analysis report

Static analysis result for SHA-256 379ced2229956398…

MALICIOUS

PDF

70.1 KB Created: 2021-10-02 12:44:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 038513abe8a9b2a3cf765110218d9b47 SHA-1: 3237e425261f926d9331184f847c42481fb1e38f SHA-256: 379ced222995639865b6c907993918808b0a62ea2d0676b5e5ee5635aaa878be
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • 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://metisentry.net/ckfinder/userfiles/files/8756425808.pdf In PDF document text
    • https://ymvii.com/admin/upload/files/muguzap.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b852d234c8---5138593066.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/161581163d1b56---9640226326.pdfIn PDF document text
    • http://schokozentrale.de/idata/gekorizu.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/fifudag.pdfIn PDF document text
    • http://sb555.com/photo/file/zudosetefi.pdfIn PDF document text
    • http://www.specemc.ru/upload/files/3196468337.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/vozutiramorolufifumujev.pdfIn PDF document text
    • https://borsalino.ro/imagini_ws/84288941190.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1613c2b5be1875---xefaxapelawifaxuwize.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/42424630381.pdfIn PDF document text
    • http://ajeah-intl.org/fck_image/file/74582160904.pdfIn PDF document text
    • http://hairtransplantmangalore.com/uploaded_files/userfiles/files/galavuzazerekovasinopubek.pdfIn PDF document text
    • https://abogadosaccidentealicante.centralcms.cloud/galeria/files/17144023960.pdfIn PDF document text
    • http://projecthouse.bg/uploads/CKfinder/files/33024600350.pdfIn PDF document text
    • http://kossuthdigisuli.hu/userfiles/file/38751564977.pdfIn PDF document text
    • http://sportingfoundation.com/uploads/file/gepixuruj.pdfIn PDF document text
    • http://aviafond.ru/userfiles/file/wonubekedij.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/borafibenovumafu.pdfIn PDF document text
    • http://cyuanmei.com/userfiles/file/pawubuxepozerulepo.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/dufowezekenoto.pdfIn PDF document text
    • http://slipa.site/0429/upload/files/22578347824.pdfIn PDF document text
    • http://nesthomes.in/userfiles/file/powusi.pdfIn PDF document text
    • https://www.nhabe.com.vn/ckfinder/userfiles/files/fevagugiroripu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=where+questions+and+answersPDF 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_off0000b175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB175 10624 bytes
SHA-256: 100e63ebdd73a85086e45b56f8e224c4257052f67b3a3748df8f809787732633
font_01_sfnt_off0000c993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC993 16260 bytes
SHA-256: 8378c75046e4d9e339e1cac92ee9348eb9d7e74fe7fda80e1f7b648102c46eea
font_02_sfnt_off0000f2cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1