Malicious PDF — malware analysis report

Static analysis result for SHA-256 dca9e82813226fec…

MALICIOUS

PDF

75.9 KB Created: 2021-09-18 22:50:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 6a0bc0040f99ae8c1340c7d6bea01912 SHA-1: 525280846cf3393c907ab8591d53d1090c413c3f SHA-256: dca9e82813226fec5841b33b5658cff56abaacc1f52de47b2a452ee4e1a1d7e4
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that point to compromised CMS upload directories or disposable hosting domains. The primary purpose appears to be directing users to external, potentially malicious content, which is a common tactic for phishing or malware distribution.

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://cn-daomeng.com/upload/userfiles/files/492e09c7edeb02657ff512c6afed4faf.pdf In PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614374d2a7647---279932054.pdfIn PDF document text
    • http://grandviewgroupresort.com/upload/files/81617525958.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161410fbc593ac---36283947388.pdfIn PDF document text
    • https://98ing.com/upload/ck/files/20210913_084746.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/47672972479.pdfIn PDF document text
    • https://solelane.com/ckfinder/userfiles/files/ludoxuvopul.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-9-15/20210915172441986896.pdfIn PDF document text
    • http://synthecinter.com/userfiles/files/fudiribomumomowexijela.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a6704deca---94485396937.pdfIn PDF document text
    • http://wmsone.com/eimages/file/86288800289.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e288a9cf32---kogejesesuke.pdfIn PDF document text
    • http://thietbiotovn.com/Images_upload/files/15784666538.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/98584129253.pdfIn PDF document text
    • http://bilafafafa.com/shopadmin/upload/files/bofarogepet.pdfIn PDF document text
    • http://talk200.com/admin/admin/uploadfiles/file/22421155676.pdfIn PDF document text
    • http://efeteknikyapi.com/userfiles/files/19316141440.pdfIn PDF document text
    • https://mp2020.csysadmin.com/ckfinder/userfiles/files/68621790101.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/c6b765283664dc5284ff4dd37940cc6c/26716014196.pdfIn PDF document text
    • https://youkuvpn.com/upload/files/woparug.pdfIn PDF document text
    • https://shevian.com/images/file/tunurukopipotomoxevu.pdfIn PDF document text
    • https://suacuasathcm.com/uploads/files/midasijarofof.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-5/20210905213701916986.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/82944534408.pdfIn PDF document text
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/vidifomipigagawavojojif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=battle+point+ioPDF 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_off0000c86f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC86F 17024 bytes
SHA-256: aac9be4da2df6837b162bca18eff498e31d280c51eda9baecefaf8af6108cde7
font_01_sfnt_off0000f419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF419 10028 bytes
SHA-256: 7dd29777e34a8e69f3b4528f106cc7b1d018782cd5d5a808addecbe32a548e8b
font_02_sfnt_off00010a7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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