Malicious PDF — malware analysis report

Static analysis result for SHA-256 749bbdaa99bd5bf0…

MALICIOUS

PDF

81.6 KB Created: 2021-09-18 07:51:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: db7c868ff9b6b33e9b39d0174861494d SHA-1: 6e0364120945e7baeb4830b9c4050529e347589d SHA-256: 749bbdaa99bd5bf00c062fe793dc2ecfb45a24bbcb27f05d8d2b6ad68e4ab728
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ClamAV and an ML classifier, with heuristics indicating it is a link farm pointing to compromised CMS uploads and disposable hosting. The PDF contains numerous URLs, many of which are likely intended to redirect users to malicious sites for phishing or malware downloads. No scripts were extracted, but the PDF structure and link farm nature suggest it's designed to exploit user trust via external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://nomylo.ru/uplcv?utm_term=i+love+you+synonyms PDF link annotation
    • https://westhigienia.hu/editor_up/59475599948.pdfIn PDF document text
    • https://wic-net.com/userfiles/file/72239598316.pdfIn PDF document text
    • https://buyafranchise.org/files/files/11164338770.pdfIn PDF document text
    • http://gmicropilotes.com/uploads/files/famavukusoxakusariz.pdfIn PDF document text
    • https://tttinox.com/upload/userfiles/files/furuwabinuxudoluwemenaf.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/fuwaratiziragunesuzej.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139ffa028b09---tesasazodawunos.pdfIn PDF document text
    • https://we-plus.tw/ckfinder/userfiles/files/58136712489.pdfIn PDF document text
    • http://my-hustle.net/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/42595070125.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/lozab.pdfIn PDF document text
    • http://www.salac.cz/ckfinder/userfiles/files/xixej.pdfIn PDF document text
    • http://www.serenissimaservizi.com/files/wadokufovexogevijawutaf.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/selusinarifo.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/ecda9c7b223c74602357b24a56789245/tipejutipawizazofizugev.pdfIn PDF document text
    • http://go-pxl.com/uploads/files/puteb.pdfIn PDF document text
    • http://skmsm.com/userData/board/file/nirexiw.pdfIn PDF document text
    • http://087334211.kad.tw/kads/ckfinder/userfiles/files/jibilagowurerurav.pdfIn PDF document text
    • https://legouic-peinture.fr/userfiles/file/vavaxuranujajudu.pdfIn PDF document text
    • https://sanaspinler.com/calisma2/files/uploads/ledizisulifowozitipateki.pdfIn PDF document text
    • https://alutat.com/data/file/72991291679.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/55376311510.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140ffb001399---sametugakaret.pdfIn PDF document text
    • http://zimmerei-possert.at/92996883548.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_off0000da58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA58 18616 bytes
SHA-256: 8c2df3b8e7b0c5b3b3b56373520f3be2d12a9cd42cc936bba42c00901c83f99c
font_01_sfnt_off00010ac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D7 10048 bytes
SHA-256: a296e18149cd42bf4b986c13a1d045b63a734f34b2f3ca07b1a6c08c0298d00d