Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec1f856cd2de5e18…

MALICIOUS

PDF

96.3 KB Created: 2021-09-20 12:49:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8bec039a7997844fea747e88e284dbcb SHA-1: b5acf97aca9f856a7893cac8694159f34ea54910 SHA-256: ec1f856cd2de5e180fd0801f39c5de10b2960286b80e6b057c3f99bd898b7deb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with many URLs pointing to potentially compromised or disposable hosting. The embedded URLs are likely intended to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9881

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 https://anne-berger.de/sites/anne-berger.de/files/fkcfile/dezazuravexuzipifiroki.pdf In PDF document text
    • http://betheaskssd.com/flash/betheaskssd.com/file/32554262675.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613479e60b449---49778552992.pdfIn PDF document text
    • https://www.idd.no/ckfinder/userfiles/files/dikipotaduniditomubi.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613656562e956---sidatamezu.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/tuziwivorelul.pdfIn PDF document text
    • https://trieurodata.ro/images/file/jifavejixepo.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/92830565409.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b62716e169---10305832784.pdfIn PDF document text
    • https://toliveinchristjesus.ceosale.catholic.edu.au/application/third_party/ckfinder/userfiles/files/negemadomobalibogexitanod.pdfIn PDF document text
    • https://bedandbreakfastholten.nl/userfiles/file/radobogototakigonaviwu.pdfIn PDF document text
    • https://aptitudeclass.com/ckfinder/userfiles/files/80524191132.pdfIn PDF document text
    • https://jechrina.gr/FCKeditor/userimages/file/zoreporub.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/lugusuxalaposataweto.pdfIn PDF document text
    • http://drzwiukryte.pl/userfiles/file/keratimigo.pdfIn PDF document text
    • http://vinmexindia.com/uploads/47443320687.pdfIn PDF document text
    • https://sarna-zapiekanki.pl/ckfinder/userfiles/files/96653638580.pdfIn PDF document text
    • http://embeddedhr.com/ckfinder/userfiles/files/41942070446.pdfIn PDF document text
    • http://www.sas.edu.mn/ckfinder/userfiles/files/21097932566.pdfIn PDF document text
    • https://hoavily.com/uploads/files/47522852179.pdfIn PDF document text
    • http://wrtour.com/FileData/ckfinder/files/20210909_465B9DF50FF57390.pdfIn PDF document text
    • https://degardo.hollandpazsit.hu/ckfinder/userfiles/files/71640495991.pdfIn PDF document text
    • https://www.jdconstinc.com/ckfinder/userfiles/files/42677960962.pdfIn PDF document text
    • http://floramarble.com/uploads/jozalisa.pdfIn PDF document text
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/fobogenosuf.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/8c04dc82d6a7ce57470663cc01cc6d03/58585946557.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/gusokabodine.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=define+pathos+logos+and+ethosPDF 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_off0001111c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1111C 10680 bytes
SHA-256: 8cc058158c51635363527c5fd29af906a17b87d271f782558f6d81ad7f3ef837
font_01_sfnt_off0001294c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1294C 19232 bytes
SHA-256: 1bca4a631f48a090590b1e881c082e28821ba73059426cee79cf7df22f4d71ec
font_02_sfnt_off00015b1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1