Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5bdda5df329d88c…

MALICIOUS

PDF

74.7 KB Created: 2021-09-17 05:19:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d077d92ebff4b6a48582d25e02a71933 SHA-1: abaf12fb6a06fbd9f989356f4e7919e1210e57c5 SHA-256: d5bdda5df329d88c8eac30b74a587ab6da3751cc61bb1c0ff3026c74bcbfc15f
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous external URLs, many hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple compromised CMS upload links suggests an attempt to host malicious content on legitimate but vulnerable websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://signatureshreyas.in/userfiles/file/solugipi.pdf In PDF document text
    • https://tekdalyapi.com/upload/ckfinder/files/fegorawajotu.pdfIn PDF document text
    • http://cyc.cz/pictures/clanky/files/nukosobofebizopeva.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/j2d5qp6hhdo19t96la6fchu41b/40210609253.pdfIn PDF document text
    • http://choinka4x4.org/cms/files/file/91420296194.pdfIn PDF document text
    • http://jszl-rolls.com/filespath/files/20210917055602.pdfIn PDF document text
    • https://riondene.ch/img/uploads/file/81573928144.pdfIn PDF document text
    • http://aczelzalog.hu/tmp/1919101733.pdfIn PDF document text
    • http://sd-admin.fazendapenaazul.com/ckeditor/uploads/files/60901107750.pdfIn PDF document text
    • http://cdseoulps.com/uploadfile/fckeditor/file/rukagoxuposivoretug.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/lisetejub.pdfIn PDF document text
    • https://hssanesteban.cl/files/27633221786.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/32015451950.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/78453558038.pdfIn PDF document text
    • http://restauraceeverest.cz/userfiles/file/8297160856.pdfIn PDF document text
    • http://viettranslators.com/webroot/img/files/16040530360.pdfIn PDF document text
    • https://phucatgarment.com.vn/ckfinder/userfiles/files/43763788159.pdfIn PDF document text
    • http://se-ty.com/uploads/userfiles/file/zuwun.pdfIn PDF document text
    • http://muasamhangmy.com/ckfinder/userfiles/files/1647066412.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/f435e16db7321ec5bd57bf7e4b247d87/35855213319.pdfIn PDF document text
    • https://zhansq.cn/upload/file/gemabukovopimivawa.pdfIn PDF document text
    • http://dreambeauty.kr/upload/fckeditor/file/mebapulajodafosutijovumod.pdfIn PDF document text
    • https://www.shropshirefurniture.co.uk/admin/ckfinder/userfiles/files/zemug.pdfIn PDF document text
    • https://taumed.kz/upload/2021/09files/210908001353134187poxfr.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16143e2a939d93---nikenosinerudiwakerinega.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=top+emulator+androidPDF 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_off0000c1fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA11 10448 bytes
SHA-256: 53759b2237b98d9e5f76795e183fc56868467b14b1a58708344156d5ee65e19d
font_02_sfnt_off0000f1a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A7 16752 bytes
SHA-256: c295ccf327ca29e9295b5cc6aa5c287c63da380175408627bbaa8813d1dca357