Malicious PDF — malware analysis report

Static analysis result for SHA-256 3489a332627a3d16…

MALICIOUS

PDF

89.0 KB Created: 2021-09-04 02:57:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3a40d63a4bcc2e1c4f4ae42fa9d3d847 SHA-1: e8216fbd065037503dde862c0933648f1fffa514 SHA-256: 3489a332627a3d16035fc25cc552b7444e54ebe571c0fb6db8f225e3bd4b3ca3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The primary purpose appears to be distributing further malware or conducting phishing attacks through these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • 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://chiesamadremarsala.eu/userfiles/files/fopegu.pdf In PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/a1266cf853fa8e0dee174c2e2949d9e5/xebafepelefabojekiw.pdfIn PDF document text
    • http://j-line.ca/fck_upload/file/zexuxoximerabujaf.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/e0d5ed539f263297a5467b25de5785d3/53646112383.pdfIn PDF document text
    • http://veno2.com/upload/sekiwazanafil.pdfIn PDF document text
    • https://cremyco.com/app/webroot/docs/file/kelepolomajebiwekasojabe.pdfIn PDF document text
    • http://hophungvietnam.com/app/webroot/uploads/files/fiduritufetenomatitod.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-8-9/20210809235740307319.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160b0e6fd20446---wonudovulewes.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d9a46766584---99393221626.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/ff8b5905a2496a1d7350e7e151b99b42/xojizudipefilez.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ebc1730323---tefuxemigoziletukif.pdfIn PDF document text
    • http://luckdidea.com/ckfinder/images_store/files/kewunuluvimexun.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/48578418150.pdfIn PDF document text
    • https://ventadeterrenosurbanos.com/userfiles/file/taxuwarodozuzu.pdfIn PDF document text
    • https://helices-evra.com/userfiles/file/73713418162.pdfIn PDF document text
    • http://dkyangmei.com/uploadfile/file/2021072209553773499.pdfIn PDF document text
    • http://cpk.by/ckfinder/userfiles/files/23341911017.pdfIn PDF document text
    • http://hosteleriayvending.com//ckfinder/userfiles/files/36097391235.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083ce54b6af5---95158000094.pdfIn PDF document text
    • http://smcertificationservices.com/userfiles/files/68953029509.pdfIn PDF document text
    • http://jia-longsofa.com/uploadpic/jialong151126/files/202108140151054434.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/gsrik59kllk42amtfclk0bg4nt/nubuwole.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=mixed+numbers+worksheets+pdfPDF 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_off0000f368.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF368 11068 bytes
SHA-256: ef516c390f0109ca198fa6142b437549125684454792b83a22d0268157275a8c
font_01_sfnt_off00010cd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD2 18560 bytes
SHA-256: c6d1c427f502cef73b22be4047163014640e25b3c7be063d79a716ee7db168a0
font_02_sfnt_off00013cd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.