Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e3fbca8c51c8ea4…

MALICIOUS

PDF

82.3 KB Created: 2021-09-23 01:18:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ba617607c1ae7ed924f8616cb7604516 SHA-1: 76b58021e03bf89f496fd95844d4f710cb3a7e60 SHA-256: 9e3fbca8c51c8ea4dece06b72259f96ff6ebb4dc17811e451322bfa0742cc54b
96 Risk Score

Malware Insights

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

The PDF file contains a link farm designed to redirect users to various websites, many of which are hosted on compromised or disposable domains. The ML classifier strongly indicates maliciousness, and the presence of numerous external URIs, including those on compromised CMS uploads, supports a phishing or redirection attack pattern. No scripts were extracted, limiting the analysis of direct payload execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • 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://catequesisnavarra.org/guiarte_userfiles/files/lakowisefagemun.pdf In PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/21edd42356a2ef1232d0bd88c61111e8/57765154886.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/patagekubenudidux.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/00aa92ae166951e64a56078f1164cbeb/50349391565.pdfIn PDF document text
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/6916248566.pdfIn PDF document text
    • http://hanart21.com/files/userfiles/file/52494435442.pdfIn PDF document text
    • https://embassyinvietnam.com/webroot/img/files/67191471123.pdfIn PDF document text
    • http://vhz.cz/user-files/45134965228.pdfIn PDF document text
    • https://www.truckersplantparts.co.uk/ckfinder/userfiles/files/59708110686.pdfIn PDF document text
    • http://gartenbaukoeln.de/uploads/files/mijajemevepazowejukeliwij.pdfIn PDF document text
    • http://paulbwatkinslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/88972333740.pdfIn PDF document text
    • http://razzledazzleevents.in/userfiles/file/natutikodiwiwovadokifixam.pdfIn PDF document text
    • http://tageedesign.com/ssmpt/documents/file/mijitomurutonuseb.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/081253559684.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/8c80668d60e9af3956793ca02ecbbb3c/65746265106.pdfIn PDF document text
    • https://baust.edu.bd/app/webroot/ckfinder/userfiles/files/77215089664.pdfIn PDF document text
    • https://www.gico.ge/ckfinder/userfiles/files/biwijune.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/deralokafividako.pdfIn PDF document text
    • http://vitacanes.com/uploads/files/48340481042.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613e67d5cfbc3---77354657593.pdfIn PDF document text
    • http://xn----otbbfbbknchz.xn--p1ai/sadm_files/17517149037.pdfIn PDF document text
    • http://www.tokyomagic.jp/images/library/File/6311520613.pdfIn PDF document text
    • https://ans5680.preneed91.com/upload/files/zeligopexedozinipiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=charlie+and+the+chocolate+factory+book+review+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_off0000d97c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD97C 18388 bytes
SHA-256: cf79d7054ac7a15cddf72beefdbe74623574ee99bd5b199314e3bed9adc5350d
font_01_sfnt_off0001098b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1098B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A2 11076 bytes
SHA-256: 8fbb2610a8aad1e1632fc63f814074f111701a05d05f8ad50f2e5bc363b9835b